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Mixing Semi Syn And Fully Synthetic Oil

soulman123
soulman123
in Ford Focus Club

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I spotted 4 litres of carlube which meets ford spec but it semi synthetic and I use fully as that's what's recommended but can you use semi for topping up .. just wondering if its ok to mix semi and fully synthetic oil ?

it was £7.50! down from £10 at my local tescos.

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    Probably not good practice to do it but I've done it many times and covered good miles with no issues

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    It's usually not recommended to mix fully synthetic and part synthetic.

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    yes as fully synthetic is a blended mixture of semi synthetic anyway

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    • Author

    As confused as I was for breakfast this morning scrambled eggs or cornflakes took a whole 15 minutes debating with my self lol

    sounds as if I'm best off not mixing. A few folks at works said it'll do no harm for topping up as its only small amounts going in with fully synthetic.

    I'm just a sucker for a bargain.

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