Join Date: Jul 2001
Location: Southern, NJ
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Re: Synthetic oil and running gear question?
I run sythetic oil in my 85 XJ (engine, trans, xfer, diffs) which use to be my DD. So far, in my new 00 XJ, I am running synthetic oil in the engine (Mobil 1). I have gear oil (Red Line) for the diffs once I get around to changing it.
I hear claims you can get better gas mileage by switching to synthetics. I can't say for the 85 b/c I never really kept track of mpgs, but I haven't noticed any difference in gas mileage in my 00 with just the synthetic engine oil.
For me, it's more peace of mind that synthetic oil protects better then conventional oil.