I know, from my 2-stroke Vespa, that synthetic 2T oil is better than dino 2T for minimizing piston & exhaust system deposits.
Question: Are synthetic auto oils similarly better than dino car oils for minimizing exhaust system/cat problems in a high-mile, oil-burning 2AZ-FE engine? I'm burning 1qt/1K miles now, which may still be "within factory specs". I don't know what consumption rate starts fouling the catalytic converter, but I'd like to forestall that for as long as possible.
Question: Are synthetic auto oils similarly better than dino car oils for minimizing exhaust system/cat problems in a high-mile, oil-burning 2AZ-FE engine? I'm burning 1qt/1K miles now, which may still be "within factory specs". I don't know what consumption rate starts fouling the catalytic converter, but I'd like to forestall that for as long as possible.