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I change every 5000, using Mobil synthetic. I notice nobody else reports using this oil...is there a reason?
IMO Mobil 1 Delvac 5-40 is the best oil that you can buy, it's just rather pricey.
I've used it in the past with excellent results, but got tired of paying through the nose for it and switched to Rotella Synthetic 5-40. I will probably switch back when I use this batch up. Cranking times to start a fully warmed up engine are a lot longer with the Rotella.