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Some people are going to call me crazy but I swapped mine out for Redline 75w140 and all the groaning went away. The other benefit was better clutch engagement (car was way smoother in tight turns). I did track the car regularly which is why I went with 140 weight but even in street driving there was no noticeable downside here in Colorado winters. I am a huge fan of Redline fluids in general, and they do make a 75w90 but I just wanted to share my experience.
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