10W40 or 15W40
There should be no problem with mixing them.
15 is thicker oil and for bigger engines.
10w40-15w40
15 is thicker oil and for bigger engines.
10W40 or 15W40 semi-synthethic
A diesel engine would use 15w40 a gas engine could use 15w40 or 10w40
probably not but 10W40 is recommended
Yes of course you can mix them what what would be the reason to do so.
according to the Peter Russek pocket mechanic Manual it says 10w40 or 15w40
No, use only the weight recommended by the manufacture which is 15w40. I suggest you use a Synthetic oil on this air cooled 4 cycle engine.
10w40 unless its a recent 1.5 diesel (renault engine) in which case i THINK its 15w40, best getting that checked out though