I had a wee ticky noise at start up soon after buying the car, and realised the seller (garage) had done an oil change with regular cheap mineral oil, and the dreaded "black sludge" problem was starting to happen, which blocks the pick up and turbo oil pipes then kills the motor. I did a full flush myself after I found the sludge and filled it with fully synthetic 5w30 oil from a motor factors, D&A in glenrothes, £35 a gallon, filter £4, and new sump bolt from Specialist Cars (vw) in kirkcaldy at £1.35, was a bit of a cow to get the under tray off and on, and the oil filter was as tight as a nuns crack, but a chain wrench sorted that eventually!
doesnt tap or tick now, and drives smoother, more revvy.