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You can only use 10w40 if it is listed in your owners manual as an acceptable weight of oil for the engine.
900ml of4T oil 10w40
not recommended
SAE 10w40
There should be no problem with mixing them.
In those years..they used 10w40.
10w40
Sae 10w40.
The majority of 4 cylinders use a good 10W 40 Motor oil. No It Will Do Just Fine With 10W40
10W40 or 15W40 semi-synthethic
ATV engine oil 10W40
10w40 summer,5w30 winter