Checked my oil earlier it was a tad low but also noticed a small amount of yellowish sludge on the dipstick and a small blob under the cap. I know when this happens it usually means head gasket! But was wondering because I fitted a catch can about 2 months ago and did the n249 bypass could it be just a bit of condensation? When I did the n249 bypass my puck valve and all the pipes where blocked with the same yellow sludge (like the pics on the how to thread) so could it be from that? I can't see any oil in my water and that level looks normal. i will be removing the sump on the weekend to do the oil pickup so I can further inspect it, just wondering if anyone has had similar issues or ideas?