Mixing oil makes, same grades..

[T40ORA]

Is there a major problem with this?

Car has Magnatec 10w 40, what's the issue with topping up with same grade semi synthetic from a different manufacturer?

[Paul_M3]

Shouldn't be an issue in my opinion.

My M3 uses a very specific 10w-60 oil, only made by Castrol.

Even so, the handbook still says it is ok to top up with a 5w-40 if 10w-60 isn't available.

Based on that, topping yours up with a different brand but same grade shouldn't be a problem at all.

[T40ORA]

I was hoping that would be the case.

But I popped onto the Opie Oils thread, and the amount of specific stuff on there quite confused me.

[krallicious]

Paul_M3 said:

Shouldn't be an issue in my opinion.

My M3 uses a very specific 10w-60 oil, only made by Castrol.

Even so, the handbook still says it is ok to top up with a 5w-40 if 10w-60 isn't available.

Based on that, topping yours up with a different brand but same grade shouldn't be a problem at all.

I've just had to mix Shell Helix with what remained of my Castrol Edge as no where seems to stock it now in Norfolk. I can onlt seem to find it in Germany. HAving said that, all BMW dealers in the UK have switched to Shell from Castrol.