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Which oil


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The only difference with the 5/40 oil compared to 10/40 is its a bit thinner for cold starts so your engine shouldn't be running any hotter with this in and the 40 is the thickness when hot..has it been changed regularly as oil in a turbo car can break down quicker than normal...?which could explain temp...? what temp was it after a normal slightly spirited drive as we love to do!

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