I've done the trans oil twice now. Both times reused the original washers and no leaks. When I do the diff this spring (2nd time), I don't plan on replacing the washers either.
For the engine oil yes because it's a compressible type copper washer, but for the diff and trans (6mt) I see little reason in replacing them unless damaged.
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G37S Sedan 6MT, Eibach swaybars, Invidia Exhaust, Weaker Clutch Pedal Spring
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