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CentralCoaster posted <<< The common thing I find when researching this, is running oil temps below 180F decreases engine life. >>> Why is that? I'm just an occasional shadetree mechanic, never torn into one- so go easy please<g> I understand if oil gets too hot it does not lube as well...

Ahhhh- makes perfect sense. Not trying to plug the forum, but I''ve asked my initial thread question to numerous mechaniics & service managers, for 10+ years. The answer was always a shrug and ''that's what the manual says' This has really helped- both in testimonials & explanations...

<<< . . . PS: I don't use these 'light weights' on most of my vintage cars...either 15W-50 Mobil 1 or 20W-50 Castrol in the older cars . . . >> If the 5w20 did so well for the newer car, why the heavier wts for the viintage ones? Rich

Can't beat that testimonial. Thanks. Rich

<<< Unless you designed the engine and/or the oil, I recommend you stick to the manufacturer's recommended grades with a quality name brand oil. >>> Just to be clear- you believe I should stay with manufacturer’s 5-30 recommendation, in slow traffic, with OATs above 110F ? I keep (cynically...

Checked thread 89-62555, but I don't think it quite answered my question. If it did, just give me the ref, and accept my apologies. I’m just a shade-tree mechanic- after oil & filter changes, maybe a battery or thermostat, today’s auto maintenance is beyond me. About 15 years ago, I...