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Synthetic oil and running gear question?

1K views 2 replies 3 participants last post by  WilliamA 
#1 ·
How many of those on this forum run synthetic oil and running gear grease in their daily drivers? Is it truly worth the added expense? My wife purchased a Hyundia Tuscon this past Dec. It has approx. 14,000 miles on it thus far. The Tuscon is getting approx. 23.5 mpg on the highway running 70-75 here in MT. Will this help improve fuel mileage? Thanx for the input. This is a great board and I have learned a great deal from the contributers!
 
#2 ·
It will help milage some in the winter, especially the diffies and transfer case lubes, the 75-90 synthetics are way better in the winter as far as viscosity. I dont run them in my 4.0 nor my 73 Dart because the 4.0 leaks and I have a bad oil control ring in one bank of the dart so it eats a little, but it is good for a newer engine and gives greater oil change intervals. I will run synthetic in my wifes van just as soon as I have 500 miles on the brand new engine in it, and if I ever get around to fixing the other 2, I feel it is worth while. I won't use it in my motorcycle because the cycle has a wet clutch and the newer oils are really bad for the wet clutch systems. J.M.O.
 
#3 ·
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.
 
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