Oil...? - Alfa Romeo Forum
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Guys -

This may be a stupid question but I don't want to mess up; Before my first service I used Selenia 20k oil to top up, now after the service I need to top up again but I'm not sure which oil the garage put in at service - on the invoice it says Mobil1 0w40? Is it possible they put 0w40 in, or more likely 10w40 and a mistake on the invoice? Either way, is it bad to mix the different weights?

Cheers, Jas.
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Just re-read my post and the last bit came out wrong - I meant if I top up with 10w40 and it's 0w40 in there, will it be a problem...?
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Q-Force's Avatar
Join Date: Oct 2002
Location: Belgium
Posts: 201
Yes it is a problem!!

Don't mix oil of a different viscosity!!!

Harmful for the engine...
I should contact the garage to be sure about the oil they have filled.

I hope it is a typing fault 'cause 0W40 is just to thin...
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County: Kobenhavn
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156 GTA SW

No harm in mixing oils, when youre in a tight spot. Best thing is to use the same oil as the one poured into the engine at the last oil change.

And yes, 0w40 is too thin, unless of course you live in a cold climate, like me. 10w40 Selenia 20K, or 10w60 Selenia Racing is the proper oil to use.

Hope this helps

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