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I always run my engines in on a ordinary mineral oil, then change to a good synthetic. I used Mobil 1 on my Vauxhall engines, and wear was very very small.
I'm going to try some Penzoil 5W40 Synthetic in my Chevy, just to see what it's like. The price is reasonable, and an American oil in an American engine ought to work!
Don't forget the cooler too....
Adam - just a thought - I know I've asked before - have you got a spare XJS cooler laying around yet??
Rob.
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