Hi. My youngest has a second-hand Polo. It's telling him it needs an oil top up - he can't find out what type or grade of oil was used before, but can be pretty sure it wasn't done by a VW dealer so may not be the recommended one.
I assume I shouldn't take a punt on grade and just top up with eg 5w-30, in case it was something else before, therefore safest to change the oil? Similarly with type - no idea if it was semi-synthetic, mineral, or whatever, so should drain and replace?
And if changing it, is it enough to drain it or should flushing oil be used? Thanks - I'm grateful for your expertise!
I assume I shouldn't take a punt on grade and just top up with eg 5w-30, in case it was something else before, therefore safest to change the oil? Similarly with type - no idea if it was semi-synthetic, mineral, or whatever, so should drain and replace?
And if changing it, is it enough to drain it or should flushing oil be used? Thanks - I'm grateful for your expertise!