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US Army 19yrs and ......
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45,284 Posts
Oil - 3000 to 15000 miles, depends on the oil you use

Auto trans - every 30,000

Differentials - every 30,000

Transfer case - every 30,000

Dexron - says 5 years or 100,000 miles.......I do mine every 30,000

DOT3 - 3 years or 30,000 miles

Power Steering - I do every 30,000

Those intervals are what I do. My truck is a 2004 that I have had since new. I'm still on the original motor, transmission, rear end....never a problem with my G80, original radiator, original power steering pump and the brakes I redid for bigger and better.

I also get 27-30 mpg in a CC 3.5, auto and 3.42

So take what I say for what its worth......but its working for me
 

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US Army 19yrs and ......
Joined
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45,284 Posts
I'm using Royal Purple in the motor, rear dif and power steering

Everything else is normal off the shelf stuff from AutoZone and Pep Boys
 

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937 Posts
Discussion Starter #4
Thanks man I appreciate the info, I'm avg. 20-21 mpg though I have the 3.73 not sure if thats the big difference but 25+ would be great. I have an 05' also original owner I'm right under 85k, I somehow lost my maintenance records so I'm gonna bust it all out at tax return.
 
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