superior lubrication technology for your Duramax Diesel engine. This
will help you learn how to best care for the Duramax, including the
options for fluid and oil change service intervals, as well as learning what GM and
most servicing dealerships don't want you to know about
AMSOIL synthetic motor oil and filtration technologies. You'll see
recommendations and options for bypass oil filtration systems, and even a
video to demonstrate how easy it is to
take an oil sample
from your truck for analysis
testing. And at the bottom is a special
Questions and Answers section - our engineers welcome
Duramax questions and
give valuable answers.
This information comes straight from experienced Truck Engineers and Lubrication
Specialists based out of the auto and truck engineering and manufacturing
capital of the world - Detroit, Michigan.
We are diesel
engine, powertrain, chassis and component experts, and are here to help you achieve
optimum performance and longevity from your Duramax truck.
You've spent your hard earned money on the Duramax Diesel option in one of
the most popular and well engineered trucks there is, now don't you think
you owe it to yourself to use the very best oil in it? Your
turbocharger needs a good synthetic oil for long life!
Petroleum oils CAN'T do that job as good. In addition, you need high-performance synthetics throughout your engine and drivetrain to maximize your Duramax fuel economy
and enable you to tow without transmission or differential failures. What should your oil
drain interval be? That depends completely on the performance and
condition of your oil and filtration, which is something you can control.
Don't let your local dealership service center tell you that you you have to use their
brand of oil to "maintain your warranty". That is one of the biggest
untruths we have heard, yet it goes on day in and day out. We
constantly receive calls from customers that were told this by their
servicing dealership. Please be aware that this practice is not
authorized or condoned by the auto manufacturers.
For a servicing dealership to essentially tell a customer that they have to
use a lower quality oil to "maintain their
warranty" is not only wrong but it is also illegal unless they
provide it free of charge. There are Federal laws that protect you against
this. Please read our "Warranty Laws You Need to Know" section of this website
to learn more.
However, the 5W-40
(CJ-4) is recommended for use at the longest GM/Chevy oil-drain interval in the
manual. Due to the lower TBN of the DEO's low ash CJ-4 formulation,
longer drain intervals will require oil analysis sampling until more data
can be collected on extended drain interval performance.
Other AMSOIL benefits include reduced sludge and deposit
formation, extreme temperature protection, improved fuel efficiency and rust
and corrosion prevention - and of course it does not void any new vehicle warranty.
AMSOIL Synthetic Lubricants meet and exceed all API rated and GM
Specifications. In fact, these lubricants are so advanced that they've
typically met/exceeded nearly every OEM manufacturer's published diesel oil test standard,
worldwide, without any reformulation.
What can you expect when changing your
Duramax 6.6L to
Amsoil's superior synthetic diesel oil?
Duramax always idled at about 40 psi oil pressure when warm, and pegged
somewhere over 80 psi when first started up. After the engine flush
procedure and change to Amsoil's 15W-40 (the same
viscosity it always had), oil pressure immediately dropped to about 28
psi warm idle, and about 60-80 psi cold. Blending over
time to the 5W-30 AMSOIL HDD, my warm idle pressure has dropped to about 23 psi. Some people
might be alarmed by this lower oil pressure, but it's a great sign:
it means that more oil is
flowing through a cleaner engine - for better lubrication, better
wear protection, better engine cooling - and it's taking
less power (fuel) to pump that oil.
The Secret Power of Nanofiber Bypass Filtration
The BEST option for lowest maintenance costs and downtime is to install an
AMSOIL Dual Remote By-Pass Filtration
System. With this nanofiber technology system you eliminate over
90% of engine wear, and only change your oil when oil
analysis indicates a need. The full flow
EaO filter is changed at 15,000
mile (severe service) or 25,000
mile (normal service) intervals and the
filter is changed at a minimum of
miles/2 yrs (or longer with oil analysis).
I have over 70,000 miles on the oil
change in my diesel Duramax truck [using the Amsoil Dual Remote Bypass
system], and I do oil sampling analysis.
Look here at one of my 6.6L Duramax oil sample reports and you'll see that I have no TBN
or viscosity problem, and wear rates are very low. And fact is, I probably will never have a
problem, even though I'm changing only my oil filters - not my oil. In
this video I used my own Duramax truck to show you how easy it is to pull an
engine oil sample for analysis:
Oil analysis can also be valuable without bypass filtration. When
using AMSOIL nanofiber Ea Air and Oil filters, analysis will usually
allow extending AMSOIL drain intervals far beyond the guaranteed 15,000
(Severe) or 25,000 mile (Normal Service) drain intervals.
gas or pre-2007 diesel vehicle applications using AMSOIL synthetics and
nanofiber bypass filtration, oil analysis will show that you
NEVER need to change your oil again - even after 500,000 miles!
How is this possible??? Simple: by using oil that is
designed to not break down, and using nanofiber filtration that removes all wear
particles, there is no longer a need to change oil. The oil is so
tough that just topping off the oil level when changing filters is
enough to renew the additive package. This saves a
lot of downtime, as well as money, and uses about 80% less motor oil -
which benefits both your wallet and the environment.
The by-pass filter removes the particles that cause wear in your engine down
to less than one micron (a micron equals 0.001 mm) and keeps the engine oil
analytically clean so you do not need to change your oil for a long time,
while still getting far better protection than someone that changes their
oil every 3000 miles. We are experienced at installing these units on Duramax Diesels and can provide you with exact installation instructions,
tips, a special custom mounting bracket, and photographs of previous installations.
One of the Power Stroke Diesels in our dealer group
has over 84,000 miles on the same oil as of November 2003.
Laboratory oil chemical analysis every 15-20,000 miles indicates the oil is
perfectly suitable for continued service. Other customers have traveled well
over 100,000 miles and oil analysis still indicates no oil change necessary.
We will mail you a copy of this vehicle's oil analysis results with your
product and technical information package so you can see the data for
yourself. My personal Duramax 2500HD CC/SB has the bypass
system and has traveled 77,000 miles with only filter changes, as of April
Here's one of my 6.6L Duramax oil sample analysis reports.
In addition, the AMSOIL By-Pass filter will also remove up to a
pint of water from your vehicle's lubrication system, which is especially
important in a diesel engine. Without this the water promotes rust,
corrosion and rapid wear. Internal engine heat also creates acids which also
wear the engine components. The water and acids build and continue to work
destroying your engine even after engine shutdown.
Oil analysis provides a big return for a small investment by: extending
equipment life by preventing premature component failure; reducing
maintenance costs by eliminating unnecessary component changes and a
decrease in downtime due to premature scheduled maintenance; enabling
calculation of optimum drain intervals that will reduce lubricant costs and
assure maximum equipment protection.
A regular full flow engine oil filter will only remove wear
particles down to the 20-25 micron range, while an AMSOIL full-flow Ea
filter removes the majority of particles in the 7-20 micron range with 98.7%
first-pass efficiency at 15 microns. But a
full-flow filter simply cannot remove all the finer particles because the
oil must be filtered quickly while removing most of the particles present in
the oil. That leaves some particles below the 20 micron range. A study
completed by Federal Mogul Corp. analyzing over 7000 main and connecting rod
bearings concluded that 60% of all engine wear occurs in the 5-20 micron
range. This is why no matter how much you change your current full flow oil
and filter, regardless of brand, that you still are not removing many of the
particles that cause the greatest wear in your engine.
Extensive testing shows that
AMSOIL Ea Oil Filters
achieve a near-perfect absolute efficiency rating. The exclusive new
technology used in AMSOIL EaO Filters provides filtering efficiency to 98.7
percent at 15 microns, and 50 percent at 7 microns. EaO Filters are the
most efficient full-flow filters that are available for auto/light trucks,
Q: How do EaO filters compare to the full-flow SDF filters that
AMSOIL offered for many years?
A: AMSOIL SDF Filters are not
quite as efficient as an EaO: filtering efficiency was 94.3 percent at 15 microns
and 51.2 percent at 7 microns. The AMSOIL SDF full flow filters
had a finer synthetic cellulose filtration media, 75% greater efficiency
and up to 300% greater capacity than other popular oil filters, as tested
according to the Society of Automotive Engineers (SAE) HS806 test method. The
filters, with nanofiber technology, are even better.
Now, back to considering the new nanofiber bypass filters,
which are used in addition to a full-flow filter.
AMSOIL EaBP Filters are high efficiency bypass filters
with 98.7% efficiency at two microns.
They also remove soot, providing the ultimate in protection against wear, oil
degradation and corrosion: your diesel's dipstick will show
remarkably clean oil, slightly darker than from a gasoline engine.
Most importantly, you virtually eliminate engine wear, because the wear
particles are filtered out of the oil.
If you choose not to install the Dual Remote by-pass filtration system
then the AMSOIL Ea full flow engine filter would be of a significant benefit
to the long term durability of your engine as well as allowing for 25,000
miles of service on the filter. When you check your oil level every
5,000 miles or 3 months, all you have to do is check the oil level and top
it off - don't drain it or change the filter. (Ignore the OLS Oil Life
System - don't use it, except to remind you to check your oil level.) When
you reach 25,000 miles/1-year you can either change the oil and filter or
take an oil sample from the dipstick tube using an AMSOIL sampling pump and
send it into
Oil Analyzer's Inc. using a pre-paid kit. Oil analysis will
indicate the exact condition of the oil and whether it is suitable for
continued service as well as determining if there are any other engine
components or wear items that you need to be concerned with.
AMSOIL has a complete line of synthetic oils, greases, transmission
fluids, gear lubes,
Ea nanofiber air filters, by-pass and
full flow filters and
systemsdesigned to extend the life of your
vehicles and equipment and save you time and money. In addition
we also offer a preferred customer purchase option, retail purchase option
or commercial account purchase option for businesses. Finally, we also offer
a Dealership Option for anyone interested in becoming an AMSOIL Dealer
and/or purchasing products at wholesale cost.
How to Reduce or Prevent Turbocharger Bearing
Seizures on Duramax Diesels
One of the
many specific areas, on turbocharged Duramax Diesel engines, that
can clearly benefit from the use of synthetic oil is the
turbocharger. When a turbocharged engine is shut off
immediately after use, bearing "heat soak" occurs due to the heat
that naturally flows out of the hot exhaust manifold and into the
turbo, adding to the high temperatures still present in the turbocharger:
all this heat "soaks" into the bearings which are no longer being
cooled by a flow of engine oil.
Over a period of time this can lead to deposits that can reduce or block the
oil flow to the turbocharger bearings, which can lead to turbocharger bearing
The hotter the
outside temperature and the heavier your load, the greater the risk to your
To combat these
problems and give your turbo maximum life, our engineering staff recommend
two things: 1) use of a turbo cool-down timer, and 2) one of AMSOIL's
Synthetic Diesel Oils (listed below). A cool-down timer gives your
engine a chance to lower the EGT (Exhaust Gas Temperature) to a safer level
before the engine shuts off. A true synthetic oil does not break down
and form deposits in the same temperature range as petroleum ("mineral")
oils. Of these two, the most important is to make sure your Duramax
engine oil is a high-quality true synthetic.
AMSOIL's Synthetic Diesel Oils are inherently more thermally stable than
most diesel oils on the market, and have been shown to keep turbochargers
considerably cleaner than other brands of oil. In fact, AMSOIL
synthetics have a noted historical reputation for maintaining turbochargers
in a clean like-new condition. Meanwhile, poor quality engine
oils have been shown to cause turbocharger bearing seizure in under 100
hours during a "heat soak" test.
Many engine oils will survive the 100 hour "heat soak" test, but...
with considerable deposits and incipient oil passage blocking. So what
you select for your Duramax diesel oil is vital for long turbo life. If you
use typical or low-quality diesel oils, it is critical that you let the
engine idle for a few minutes after use, to allow the engine and
turbocharger to cool. This cool-down does not eliminate deposit formation when using
petroleum diesel oils, but it can dramatically reduce it.
Take a look at the varnish deposits in this picture below. These are the results
of a severe high temperature deposit test with some of the most trusted
commercial brands. This test clearly shows that
AMSOIL keeps engines cleaner longer than other major brands of diesel oils.
Which oil would you rather have protecting your Duramax turbo-diesel engine?
The bottom line: To
prevent or eliminate turbocharger bearing seizure, there is no substitute
for a high quality synthetic diesel oil (like AMSOIL's) as they have been
have been proven to maintain turbochargers in an almost "as fitted"
condition, and significantly reduce deposit formation.
We are here to help you learn the facts
and to show you how using superior AMSOIL products will
increase the performance and add to the longevity of your Duramax Diesel,
while saving you time and money. Duramax Diesel trucks are excellent vehicles and
exceptionally well engineered by General Motors. In our opinion, they are one
of the most advanced vehicles ever produced. However there are ways to make
the performance and longevity even better with AMSOIL Synthetic Lubricants.
We have an article describing an AMSOIL user with 731,000 miles on his 1993 Ford Aerostar,
on the original engine and transmission. He was using AMSOIL from
the beginning. This type of mileage performance is unheard of
in basic passenger vehicles with conventional petroleum oils, but is
not uncommon when using AMSOIL synthetic lubricants. However,
newer Amsoil synthetic oil and filter technology have recently
enabled the "million
mile van" which is still running strong.
How much money was saved by not replacing those vans every 200,000 to
My Duramax diesel truck gained 8% in fuel
economy, and my car mpg improved 10%. While most customers
will only get a 5 to 10% fuel economy improvement, gains of 20% are not unheard
of in some vehicles.
Phillip is a
customer with a 1999 Oldsmobile Silhouette van who had changed his motor oil
at 3,000 mile intervals. In the spring of 2005 when he used Engine
Flush and changed to AMSOIL engine oil with about 85,000 miles on the
odometer, he got an instant 20% fuel economy increase which has been saving
him about $12 per week. That annual fuel savings of more than $600 is six
times more than the $100 annual cost of the AMSOIL products.
produce more rapid breakdown of ANY engine oil.
No matter what brand or type of engine oil you use, you will
need to closely monitor your oil performance with oil analysis
and shorten drain intervals as your use of biodiesel blends
increases. In many cases, this will mean cutting your
previous oil drain intervals in half (assuming use of the same
engine oil). If extended oil drain intervals are not
shortened or at least monitored with oil sampling, biodiesel contamination is likely to produce engine
damage due to oil failure.
Despite your owner's manual recommendation of a
15W-40 oil, your Duramax engine - like nearly all engines - is
designed to use a 30-weight oil. The 15W-40 recommendation is
based on the assumption of petroleum oils which will often "shear
back" to a 30-weight oil in diesels, and if you use a 30-weight oil
that shears back to a 20 weight oil you will have wear problems (or
worse). Of course, AMSOIL's HDD formulation will maintain
viscosity as long as you are using it as recommended in a healthy
engine (no fuel getting in the oil, for example) - so your engine
will enjoy year-round benefit from the 30-weight oil it was designed
for, including better fuel economy.
Both the AME and HDD oils are 25,000
mile oils that outperform every other available diesel oil on the market,
and are LESS EXPENSIVE to use because of those extended drain intervals.
Both oils are also superb performers in
gasoline engines. The DEO oil exceeds the performance of any other
CJ-4 oil on the market. Any of the three oils will work well for you,
and they will all increase your Duramax fuel economy, but our best
recommendation is for you to make an informed choice based on your specific
needs. Here are some suggestions to help you:
For this Application... Pick this oil:
2007 & later
models (CJ-4 spec is req'd)** 5W-40 (DEO)
All-fleet oil for class 3-8
15W-40 (AME) - or 5W-30 (HDD)**
oil for logging/heavy-construction 15W-40 (AME),
*While it is
difficult to compare them, Engineers generally believe the thicker 40-weight
(AME & DEO) may provide slightly more wear protection than 5W-30 (HDD) in
extremely heavy applications, particularly off-road/gravel where drivetrains
can be subject to heavy torsional shock-loading. However, for
highway/city mileage, HDD fuel economy savings probably exceed savings from
reduced wear with AME - if there is any measureable wear reduction at all with AME.
Experience has shown that changing to any of these three AMSOIL synthetic
oils will produce fuel economy benefits for your Duramax.
**5W-40 (DEO) oil is also a fully
backwards compatible, all-fleet oil. So if using one oil for your
entire fleet is one of your most important considerations, and your fleet
includes 2007+ diesels (or earlier with DPF's), this is the oil to use.
However, be aware that the low TBN restrictions of the CJ-4 spec
means that extended drain intervals will not be possible on your vehicles
without oil sampling analysis. (DEO has a TBN of 8.0, vs 12+ for AME &
HDD.) For this reason, our best
recommendation is to use two fleet oils. One for gas and 2006 or older
diesels, and the other for 2007+ diesels.
Simply changing your oil more often with
"reputable" oil will not give your
Duramax all the benefits that AMSOIL offers:
You will not get improved fuel
economy, you will not get reduced engine wear, you will not get reduced
operating temperatures, you will not get extended drain intervals and you
will not save money in the long run. Please, allow
us to show you a better way. We are here to help you. You have everything to
gain and absolutely nothing to lose!