Hello all.
Due an oil change on my Td4 FL1. I have some oil left over from previous oil changes, shell Helix 5/40 and Halfords 5/40 both fully Synthetic. Question is can I use them together.
As long as no dirt / cr*p has got into the containers while they've been sat, then no problem.
You said they're from previous oil changes, so they've both gone in before - no reason they can't be mixed.