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I have an R33 GTST with a noisy/notchy gearbox. I've replaced the oil with Mobil 1 synthetic gearbox oil which has made minimal/no difference.

What's the general view of using PTFE additives in the gearbox?

Lots of bad things are said about similar products in the engine blocking galleries etc, but you don't have those issues in a gearbox.

People have mixed theories about adding the nulon g70.

Personally, I have used the nulon engine oil additive, and it had no adverse effects. I don't use it anymore, because I just don't see myself keeping this engine for 250+ks, so i'll save my money there, but as I said, I have used it about 5 times, without any problems.

I have used the g70 box treatment, and I didn't notice any difference in notchiness.

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