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Old 06-05-2021, 06:32 PM   #2
ZX-10R

 
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Drives: 2019 ZL1 Riverside
Join Date: Apr 2020
Location: Charlotte, NC
Posts: 1,139
Not sure why GM recommends 15W-50 for track. My brother used to work for GM Advanced Vehicle Engineering Lubricants Division and always told me 10W-40 is more than enough for track use, where some viscosity loss can be expected. Hot viscosity is about 60% higher than 5W-30 https://www.mobil.com/en/lubricants/...obil-1-15w-50/
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