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Here's my experience with Motul:
I compete in SCCA RallyCross and my last car was a 03 WRX with a swapped STI V7 6MT. I used both Subaru Extra S and Motul 300. The Extra S began to lose its heat resistance after about a year of competition. Once the oil got some good heat in it, shifting would begin to get a little notchy. The Motul lasted through two seasons before I started noticing a drop in smoothness.
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