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Discussion Starter #1
I went through my glove box today and apparently I am missing the Duramax Supplement, how likely is the selling dealer to give one to me now?

I wanted to check out the GM recommended fluid change intervals, are they posted online somewhere?

My DIC says I am at 30% oil, but only a few thousand miles.

TIA,
Ron
 

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Oh...... Squirrel!
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I've been doing....

7500-10k oil and filter changes
15k fuel filter changes
50k allison spin on
100k allison spin on and fluid change (haven't reach it yet)

66k miles and hasn't been to the dealer once except Heated Washer Recall. Mild towing...sub 10k lbs. 20' car hauler and a heavy Jeep Wrangler Unlimited here in Colorado.
 

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Discussion Starter #7
Dealer told me the supplement is in the mail...
DIC says its about time to change the oil, what weight and spec do I need for the LML? Do I change the spin on tranny now too? If so, what tranny fluid to top it off?
TIA,
Ron
 

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Dealer told me the supplement is in the mail...
DIC says its about time to change the oil, what weight and spec do I need for the LML? Do I change the spin on tranny now too? If so, what tranny fluid to top it off?
TIA,
Ron
Use engine oil API CJ-4, 5W-40 or 15W-40. You dont have to change the spin on now.

IMO dont go off the DIC %. Do your own schedule maintenance. Go by miles. Make it down & go off of that.

I do the following:
Engine oil/filter, 3,500-4,000K
Fuel filter, 10K
Spin on trans filter, 10K
Air filter, 10-15K
Trans fluid/spin on filter, 50K
 
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