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but based on my conversations with Greg D. and the sample results for 0W40 in my track Z I switched to 15W50. I notice oil pressure stays up during hard track sessions and the UOA shows it stays in grade and near its VI at 40 deg and 100 deg C tests better. I may try 5W50, however it's not readily available here, you have to go to a distributor and pay full price to get it. M1 15W50 routinely goes on sale at the usual outlets.
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