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DD only? Change it every 30k or so
Occasional track day? Maybe annually.
Track junky? Depends on heat/abuse/power etc.
Washers:
Washer and "gasket" are used interchangeably. A copper crush washer, by definition is a "gasket". On anything that's low pressure (transmission/engine/diff) I'll flip a copper washer and reuse. I will only flip and reuse an aluminum washer if I have nothing else because they actually do a lot of compressing and once compressed, if reused can be much more prone to leaking. So for me aluminum is a once use, copper is a reuse.
Exception: Fuel. I never ever reuse a washer in a fuel system. (Fuel filter, fuel rail, whatever) A low viscosity fluid that's combustible and under a lot a pressure means the that seal is very important.
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SCCA T4 - FRS
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