ROLO, The Castrol synthetic is probably great oil. However, the latest version of Mobil 1 is one to two generations ahead of all the other synthetics. That's probably why you don't see Syntec as factory fill in high-end Porsches, Mercedes, CR5 Corvettes and so on. I've got personal experience with over 2 million miles in a small private fleet of turbo powered pickups and semis without a single engine or turbo failure, all using Mobil Synthetic products. It has a lot to do with my signing on the dotted line for a turbo enhanced vehicle to call my own. That said, it's still much more important to keep it clean!
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\'07 Cognac Town and Country Touring - no turbo
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