Comments by "crazypj" (@1crazypj) on "Is more ZINC better? CASTROL GTX vs CASTROL GTX Classic" video.

I was never a fan of GTX and used Duckhams 20w/50 as it had much lower sulphur content plus was OK for motorcycles with wet clutch. (Duckhams used same process to make/blend oil as piston engine aircraft 'aviation oils' ) Even though Honda dealer I worked at used GTX, I didn't and when I was running workshop I switched bulk oil supplier In the 80's, GTX was also ok but it got dirtier much faster, Duckhams absorbed more water if bike wasn't ridden hard (condensation in crankcase) so we would switch those bikes to Valvoline In Britain, there were multiple tests done in the late 70's through mid 80's. ZDDP 'optimum' was said to be 1,800PPM, BUT, over 2,300 PPM was found to damage bronze bearings (often used in transmission.
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@letmethinkv said at end, 3~5 years. Pretty disappointed as well because I 'stocked up' when I was working knowing prices will go up and income go down. I'm hoping Mobil1 is going to last longer?
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@johndeere1951a Interesting to know. I still have it on shelf so will check by pouring it into a white container if I ever decide to use it.
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