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Just another data point:
I use Ford's newish Motorcraft XT-M5-QS GL-5 MTF. I basically use this on all my manual cars that call for GL-5 and it's excellent. I prefer it to the Redline products, because it works very well at low temperatures too. It definitely had a great impact on overall shift quality, but it is fairly expensive.
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2022 Hyundai Elantra N 6MT SCCA TT S3//Will be back in an 86 eventually
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