I bought a new Chevy extended cab 2500HD with Duramax on Saturday and just
have a few questions for people. I grew up on a farm in Northern Minnesota
so I do know how a diesel runs, etc. I just have some questions for other
Duramax owners out there.
How often do you guys change your oil and what type oil are you running?
How often do you replace the fuel filter?
Is there any need to let the turbo cool off on these trucks before shutting
down? I know with the big Cummins on the farm we use to need to let them
idle for about 5 - 10 minutes before shutting them down to let the turbo
cool off. Although these tractors were working really hard. I know that
they need to be run slow when cold.
Any other tips people can offer as far as running a Duramax goes...
2003 Chevy 2500HD Extended Cab with Duramax
On Mon, 28 Jul 2003 06:38:19 -0500, "Curtis Bergeron"
Congratulations on the new truck.
You should take a look at www.thedieselpage.com and its forums.
Non-members can look at the forums without joining, and by using
search you can probably find lots of answers (or at least opinions) on
all kinds of Duramax questions.
Now, as to your specific questions:
The oil change indicator on the Drivers Information Center (DIC) is
supposedly based on how hard you are running your engine. In normal
driving, it would lead you to believe that oil can go 10,000 miles or
more between changes. And the Duramax oil stays amazingly clean for a
I would change oil and filter with conventional oil at 1500 miles,
again at 5000 miles, and then go with either synthetic CH-4 or CI-4
rated oil on a 5000-6000 mile cycle, assuming you are not towing big
GM recommends 15-40 oil except in very cold weather, when 5w-40 is
recommended to avoid over pressure when the engine is cold.
I have heard the factory fill is Mobil Delvac 1300. Other great
conventional oils are Delo 400 and Shell Rotella T, all on the shelf
at Walmart for around $6 a gallon (an oil change in a Duramax is 10
Many, however are running synthetic oil, 5w-40 year round. The
leading brands are Mobil 1 Delvac, and Shell Rotella Synthetic. The
Mobil 1 Delvac is hard to find retail, but can be ordered from Mobil
distributors. The Rotella Synthetic is sold by WalMart and often goes
on sale for under $13 per gallon. I heard, however (not confirmed)
that WalMart may be phasing out this brand. I run Rotella Synthetic.
For filters, an alternative to factory filters is Baldwin, a well
respected brand. I buy mine in volume discounts from www.adiesel.com
in Boston Mass.
For fuel filters, I think it depends on where you buy fuel. If you
are a gypsy and buy fuel from "questionable" places, you will need to
change more often than if you always buy from large volume locations,
such as FlyingJ. I think 15K is recommended. From the guys at the
Dieselpage, some are adding 2 micron filters in series with the stock
filter to eliminate microscopic dirt to protect their injectors.
Nobody at Dieselpage seems to be particularly worried about turbo shut
down, but I think common sense is in order. As a practical matter, I
don't think you are going to be running real hard and then chopping
off the engine before things slow down/cool down from peak levels.
Make sure you do not forget to change the spin on filter on the
Allison at 5000-7500 miles.
In winter, it takes a long time (around 10 miles) for the Duramax to
fully warm up. If you are going to use it for short commutes in
winter, you may want to put on the grille cover that you should have
received with the truck in northern climates.
And expect to see some amazing fuel economy for a truck of that size.
I have a 2003 Crew Cab and see as high as 21 mpg on long distance
interstate type driving, and usually at least 17.5 in short range
The Allison filter is very easy to change. It just sticks down from
the bottom. Looks like a little spin on like you would find on a
small 4 cylinder engine. When you remove it, there will be a
magnetic "donut" on top. Make sure you put it on top of the new filter
and reinstall it, do not accidentally discard it. The only
transmission oil that "comes out" when you spin off the filter is the
oil in the filter itself, maybe 1/4 pint or so.
The only filter that is at all difficult to change is the fuel filter,
because of limited clearances.
Hastings are also supposed to be good, but Baldwin at www.adiesel.com
has all the Duramax filters, oil, Allison, fuel and air. So I just
ordered them all at once.
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