Evening all. This afternoon I went to my local helpful halfrauds, armed with a trade card to buy oil for my bike. I've only this bike for about two weeks. its done just over 500miles, its a Skyjet 125-26, yes, yes, I know it Chinese, and I know how people feel about these, but that is by the by, it will get my by until I take\pass my test. I looked in the bike book before I left home, and it said I need to use at least 15w-40 as they didn't have this in stock, I picked up 10w-40 and just to check, asked it was ok to use that, I spoke to some woman, who said "no, you have to use what it says in your book" I'm quietly confident this isn't the case and 10w-40 would have been fine, could someone please clarify this? Thanks. Karl