Mixing oils

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Can you mix semi synthetic and fully synthetic oils together ?

I ask as I spotted 4 litres of semi synthetic oil in tesco for £7.50 the
cheapskate in me jumped out and thought hmm cheap but my 1.8 04 petrol focus
takes fully synthetic. The semi sync oil meets the ford spec though and I
would only use it for topping up for a year till the next oil service.

Just wodnering if this is ok or a bad idea ?



Re: Mixing oils

Adam spake thus:


Personally I wouldn't. If you do your own oil changes then just get a few
litres of the correct stuff, it'll keep until the next service.

Even if it costs you four times as much it's still less than the cost of
half a tank of fuel.

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