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I was suffering from a notchy gearbox in 996 mx for a few years. My mate stipped the box down (he is a fully qualified engineer-works for TVR) and said it was in good nick. So I have been trying to find an oil that will at least help a bit. Having tried red line, motul, castrol, mobil 1 and 76 I believe I may have cracked it. A while back a mate put me onto Royal Purple. It needs a longer term test, to check for its overall wear protection etc (which I have been assured by Royal Purple UK is very good), but it has DEFINATLEY made a reasonable improvment to my gearchanges.
I will keep you posted.
I will keep you posted.