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I use Mobil1 in my car but my friends with STIs use Royal Purple. I dont use RP cause I did feel like it would start thinning out when it got too hot but my STI friends use it. They said they were burning M1 and didnt have a problem running RP. My friend with a VW says his uncle has been putting RP in the car since he can remember and thats what the car has been using for the longest time.
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