any techsperts able to confirm if the oil filler neck (plastic) varies on the GC/GD models? I know the RS had an aluminium unit but I want to confirm the size of later model ones and if indeed there's a change. Im getting a little fouling on the top of my oil return setup which sits above the filler, and being this is a guaranteed no-foul fitment, presume the oil filler neck may be different?

cheers

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They changed in shape all the time. GC8 changed with MY99 it quite possibly changed again with AVCS?