@colin84 yeh ! The little ridge bits near the bottom of the dipstick
two problems then looseing water and oil leak..........what gasket did he wipe .... could be small oil seal on crankshaft...oil pressure switch ....water leak gee take your pick .....oil light on lack off oil ....or pick up pipe in sump blocked common problem on vauxhalls ......where in belfast ???? im bored today