Can i mix synthetic and mineral oil
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Sir Brixalot
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Can i mix synthetic and mineral oil
Hi All. The previous owner used 15/40 synthetic. It could do with a top up - can i just use 15/40 mineral to top up? cheers
Honorary "Dave"
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California Dreamin
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Re: Can i mix synthetic and mineral oil
There isn't such thing as a fully synthetic 15W40 engine oil, the only choices are semi synthetic and mineral.
It will be absolutely fine topping up with mineral.
Just remember the oil isn't long life so will need changing regularly at 5,000 mile intervals or less.
Martin
It will be absolutely fine topping up with mineral.
Just remember the oil isn't long life so will need changing regularly at 5,000 mile intervals or less.
Martin
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CovKid
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Re: Can i mix synthetic and mineral oil
Tread carefully Martin 
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