50k km is considered practically new. Worn is like more than 200k km on them, but if engine have been taken care off, like not thrashed, oil change on regular basis they can last more than 300k to 400k km easily. If they show signs of wear like consuming engine oil that is where you start to use thicker engine oil like 20w-50.
Okay, back to your question on the 10w-40. What oil viscosity is recommended in your owners manual? normal viscosity used among the cars are for Full synthetic oil is 5w-30 or 5w-40, for semi synthetic will be 10w-30 or 10w-40, so there is no harm in you using the 10w-40.
On multi grade oil, it is oil that has multi grade option when cold or hot. This means like single grade 40, it is 40 weight thickness whether when cold or hot. A multi grade oil like the one you mentioned 10w-40, is thin like 10 when cold or heavy like 40 when hot, that is why multi grade is a better oil
Awesome, thanks again Turbo. On average I only use 30kms a day and am I not a boy racer so I manage to look after it so far.
The manual says SAE 5w20, 5w30, and also 10w40.
Ah I see. I didn't think about winter and summer. Cool, I will use the Helix 10w40 then. Thanks