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I am interested in this and want to relate an oil experience. Had a car with a bad lifter (a Pontiac of course) . Running 20w50 worked ok, but on a long trip, the lifter would start clicking...louder and louder and eventually, it would lose all prime or pressure and I would get a dead miss on that cylinder...............If I ran straight 40 wt in engine, on the same trip, I would get some clicking, but never lose the cylinder. I can only conclude the obvious.
However....I am running 20w50 Castrol in the Sportster on days of 102 deg. here in MS.
NO traffic, however, just in rural roads or interstate. If I had stop and go and traffic driving in this heat, I would go to straight 50 for sure.
Good Luck...........Pete
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2005 Sportster XL883C
Poplarville, MS
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