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73-87 Chevy _ GMC Trucks => Suburbans => Topic started by: AdrianR on May 24, 2011, 10:13:18 PM

Title: K10 Suburban - What Differential Oil
Post by: AdrianR on May 24, 2011, 10:13:18 PM

O All-Knowing Oracles  ;)

Methinks it is time to change the oil in both diffs on my Burb (see sig).
What's the best weight/type oil to use and how much does each diff take?

thanx

Title: Re: K10 Suburban - What Differential Oil
Post by: Lt.Del on May 24, 2011, 10:17:55 PM

i'd use standard gear oil, 80w or thereabouts.  Fill it up til it pours out the plug hole.

Title: Re: K10 Suburban - What Differential Oil
Post by: topp on May 24, 2011, 10:19:01 PM

If you have a Limited Slip Diff, you need additive.....

Title: Re: K10 Suburban - What Differential Oil
Post by: Grim 82 on May 25, 2011, 09:02:24 AM

I read somewhere that you can gain 1 mpg by running synthetic in the diff's, but I can't testify to those results. Plan on about 3 qts or so per diff to fill them.

Title: Re: K10 Suburban - What Differential Oil
Post by: Skunksmash on May 27, 2011, 05:24:42 PM

I use royal purple full synthetic. Never had a problem out of it. Haven't really tested the MPG's since I started using it though. However, I never added any additive. And I'm sure my 87 has limited slip, as do most vehicles these days. Which additive should I use?