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AirCooled VW's had an oil cooler thermostat :-)
I don't have scientific data, but I would change my oil in the supra when the mpg dropped 2 tanks in a row from expected, then it would return. Could be psychological.
I'm running an oil guard on the Golf for just that reason.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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