Hey, got myself a Merida eone 20 - 800 and have always rode a hard tail before this. I noticed on the rear shock that arm that there seems a like a very fine layer of lube/oil. Is this normal for rear shocks? Doesn't seem to be leaking onto the bike or anything, bit it kind of feels oily if you were to run your finger over it. Only done like 6 rides as I got it last week.