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You could go 20w50 in San Diego if you're not going into the mountains (ie: cold temperatures). If you're a skier I'd stick with 10w30 in the ski season for sure. Viscosity is dependant on the ambient temperature as much as on the age of the engine. Synthetic seems to get better mileage.
btw I run 15w 40 Shell Rotella when I can and I've got 400,000kM on mine. I've also run synthetic (tranny/transfer and axles are all synthetic ALL the time) with good results and straight 30w when I had a long cross continent trip to do. It kind of depends on the use you make of the truck as well.
valvoline 20w50 on two older engines.
PROOF. what we need for our rigs is proof gentlemen.
I have yet to see anyone on this thread mention Oil Analysis.
valvoline 20w50 on two older engines.
Search Blackstone or oil analysis. You'll get tons of hits in the 80 section, and a few here
I run Valvoline VR-1 10W-30 Racing Oil. I do this on the advice of an engine rebuilder in Spokane (Motor Works) who told me that they were seeing an increase in worn camshafts on older flat tappet engines since the EPA removed a zinc/phophorus additive from essentially all common motor oils. The additive is call ZDDP or some such acronym.