Mixing different types of engine oil

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Thu 16 Jun 2005 08:39
Mixing different types of engine oil - L'escargot
My car has just been serviced, and the engine filled with fully synthetic oil. In the unlikely event that the oil needs topping up before the next service would it be permissible/acceptable to top up with semi-synthetic oil? (It's just that semi-synthetic is what I happen to have already.)
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L\'escargot by name, but not by nature.
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Thu 16 Jun 2005 11:28
Mixing different types of engine oil - J Bonington Jagworth
Unless your engine has always had synthetic in it, it's already had to blend with some non-synthetic, and, AFAIK, semi-synth is such a blend itself. I don't think you need worry!
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Mon 20 Jun 2005 17:40
Mixing different types of engine oil - oilman
The answer is you can do it but.......why would you do it?

You're merely watering down the benefits of the fully synthetic.

Cheers
Simon
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