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No, just leave it in OD while driving on the highway. If it needs more power it just downshifts or step on it But unless its a big hill or passing then it is fine. **Any idea on whether to use a different oil filter for M1 oils or just use stock?

LOL, thanks Points I checked it out today, no leaks or loss. Course it could take a while like you said for it to clean it out and run the old stuff through. BTW, when I had the oil changed the guys said the whole underside was "Muddy" Yeah, you know what I'm talkin about...thanks for pullin...

EDIT: I noticed the forum didn't have a edit feature. But we use the Tahoe and my Mom's Yukon Denali to tow a snowmobile trailer and a 18 1/2 ft. boat. Nothing too big. And yes we use OD to tow on the highway. And have used 3rd for side streets that are snow covered a few times.

Someone else said it, The FSC.com website is www.fullsizechevy.com I frequent that and has helped me out in a lot of things. You should check it out if you have a FSC=Full Size Chevy/Full Size GMC As far as the transmission, it went bad after taking a 350 mile trip from home to college. I...

Hey, I have been doing some reading on Mobil 1 and have asked on FSC.com about if I should change to Mobil 1. I recently found this website when my friend told me about it. Anyways, I drive a '97 Chevy Tahoe, 5.7 with 89,xxx miles on it. I was worried of making this switch with such high...