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Those are all other issues IMO. Synchromesh is clearly marked yellow metal safe which is the issue with GL-5. Synchromesh is not GL rated because it was designed to meet GM specs. GM 9985648 spec happens to be alot like GL-4. I used it 10 years ago in B15 and have a little mixed in on the miata right now to make a good blend.
Kind of afraid of ruining a good P11 trans, even though it's only the wife's car
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