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I'm thinking of switching back to 10/40 semi synth Magnatec. If I drain the Mobil that's in there and refill with the Magnatec would it be ok to top up using the left over Mobil 0/40 to bring it up to level? The mobil's fully synth and they're different viscosities but would save me an extra 10 quid buying an extra litre can. Or am I asking for trouble?
 

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bigfella-network.co.uk
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I think it will be fine. I had a mate who had a 309gti and used half diesel oil and the rest thinner petrol oil just to get the stuff used up. Ran fine for many miles.
 

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You don't need to be as fussy as some of us make out tbh. As long as its tidy oil & is saving you a few bob its not going to cause any harm at all.
 
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