Ok I drained the factory gear oil in my manual transmission at 2000 miles. What I didnt do is check the rating of the oil until after I put new in. It calls for a gl-4 rating and I put in Amsoil Sever Gear gl-5 rated. Should I redrain and put gl-4 in or do you think it should be ok for 30-40k miles. Any help would be greatly appriciated. I heard gl-5 oil after digging in can be bad for syncronizers.
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