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Interestingly I had a conversation with Mobil 1 technical a few years back about 10/40 and 10/30 and turbos...they were firmly of the belief that the 40 was the way to go...annoyingly I can't recall why now!
Oh, I new there was a point to this post....the synthetic has better resistance to burning in the turbo and has a life of circa 10,000 miles (depending on the vehicle and driver), ordinary mineral oil turns slightly acidic in 3,000 - 6,000 miles.
On the mineral non-turbo diesels I've had before I dump the oil every 4,000...avoids sludging nicely.
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