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View Full Version : my engine oil needs a top up can i put 10w40 with 5w40



andreas395
09-11-2008, 21:41
i have 5w40 fully synthetic in there but i have a 1 lt of 10w40 semi synthetic here can i top it up with this thanks 8)

number1
09-11-2008, 22:22
Would have thought it would be fine

Dave

Yanoo_
10-11-2008, 07:23
Iff their MIL codes are the same you may have mix them, but not suggested. I would definitely avoid it.

Mark One
10-11-2008, 12:39
if opie oils say it's fine, then it probably is.

...and they do :)