« on: Feb 16, 2018, 10:03:32 AM »
If we are going to get all oil discussion-ee... I am back on the fence on synthetic. I used it last winter in my 22r (Mobil 1 0W-40). It sure made the cold starts easier, but I have a hunch it may have been too thin. After 9 or 10 months on it my rings went. Could have been my journey into the dark art of carb tuning, the engine autopsy will reveal it if it was.
Anyways I think I am going to go back to conventional with no additives after break in. Fancy oil stuff just doesn't seem to work out for me.
A 40wt oil has to meet a viscosity spec that is the same for synthetics and conventional oils. The 0w-40 is thicker when “cold” at startup than it is at operating temperature so the 0w vs. 10w doesn’t make any difference other than the 0w is closer to the operating temperature viscosity at startup which is good. Synthetics have natural detergent properties so can clean out gunk in/around gaskets and expose leaks but they don’t cause them. My 85 had a leak with synthetics that was resolved by going back to conventional oil. It’s possible that the increased “slipperyness” of synthetics might allow it to get past the rings easier.
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1989 4Runner: Dual Ultimate (Inchworm front & Marlin 4.70 rear), Marlin Twin Stick, 1200-lb clutch, 4.88 R&P, Aussie Front, Detroit rear, 30-spline Longs, Long hub gears, ARP hub and knuckle studs & 35x12.50 Cooper STT PRO tires. Marlin rear bumper & sliders. FROR front bumper. SAS with Alcan springs & Rancho 9000XL shocks. Budbuilt Bolt-on traction bar. Custom Interior Cage by Those Guys Rod and Customs.
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