mixing engine oil

Honest John Back Room » The Back Room Archive
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Mon 5 Mar 2001 11:32
mixing engine oil - David McKee
My diesel car had the oil replaced with mineral oil. However, when it required topped up I added half a pint of Mobil 1. I have now been told that the two oils should not be mixed. Is this the case? and if so what damage is likely to occur?
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