Originally Posted By: lukejo
Originally Posted By: CKN
Originally Posted By: zeng
Originally Posted By: lukejo
Transmission fluid,filter, and transfer case are of course listed at intervals on the maintenance schedule. However, neither differential is listed...even under severe duty out to 150,000 miles?
Manufacturers know best ??
Oh no, I wouldn't trust one.
Your right...the "shade tree" mechanics on BITOG know so much more than the guys who design them and put them together......
Funny--both of you--and you each represent one side of my brain on this. I tend to lean towards over-maintaining, thanks to no small part from this forum. On the flip side, so many on here now say it's safe to trust the OLM for your OCI's on most engines...even though that is much longer than tradition OCI's. Yes, motor oil is much better now, but so is the diff fluid that GM uses. So should I trust the OLM, but assume they really got the differential maintenance wrong? Kind of a rhetorical question, but that's what plays out in my mind when wanting to do more/sooner than the manufacturer recommends.
The OLM on a GM vehicle cannot account for one thing-and one thing only. And that is driving through dusty conditions regularly. Otherwise-use the OLM with confidence. Your right-oils are better than they ever have been! The differential should be changed. I do not have an answer as to why it's not listed. As I mentioned-as a former Silverado owner (I have a Sierra now) I changed it out at 50,000 miles-half of which were towing miles. Any sooner (again IMHO) is a BITOG MONEY FLUSH.