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Originally Posted by Perfectlap
don't mean to throw a bomb on the party but I'm going to stop using Mobil 1 and start using Castrol Syntec 5w-40 which is on Porsche's approved list. M1 was changed recently and I've heard it doesn't provide enough protection for both chain and bearing wear. Its obviously a controversial topic but if you search Pelican and Rennlist you'll see at least one engine rebuilder who will not guarantee a rebuild if M1 is used at all or zero weights.
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Sounds like good information. Why did you choose Castol other than the approval? Have you ever used Redline? It gets high ratings from the members here.