Comments by "crazypj" (@1crazypj) on "Will Thinner Oils Damage Your Engine?" video.

  1. If you read anything about oil since around 1985 you would know it's due to lowering of ZDDP from 'optimal' 1800PPM to less than 100PPM (or zeroin many synthetics). ZDDP kills catalytic converters which have to be covered by manufacturer warranty for 5_7 yrs/100,000 miles. (last time I checked, around 2012)
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  2. Using what manufacturer recommends is great on newer engines but what about 'Classics' ? I have no idea where (or why) I would want 1950's, 60's or 70's oil. Have you done a video on oil clearances in internal combustion engines and how that affects required oil viscosity? Do old style engines have tighter tolerances when being re-built today ?
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  3. I'm not an engineer (think I've mentioned it before on your channel?) Two points. 1. Oil jets are not to lubricate cylinder walls but to cool piston tops. It's a very old 'technology used in 1930's piston engine aircraft. A byproduct is much better lubrication of small end bearings 2. Thinner oils do a much better job getting into area's designed for 'splash lubrication' as the oil can fling around at lower rpm so provide better lubrication and cooling. (valve springs, etc) Biggest issue with oils is the type of drive system for camshafts, belt drives give oil easiest time, chain drives break down VI and gear drives break viscosity improver's very fast. VVT engines, I'm not sure about as I haven't done any testing Motorcycles where engine oil is shared with transmission can and will destroy V.I. within a few hundred miles particularly if there are any helical gears in system, oil change interval drops to 300 miles or less (about 1/10 normal interval)
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