Very informative. White sludge on the inside of the oil filler cap CAN be from condensation if the van is only used for short runs, but I agree, it can be a sign of a blowing head gasket which is not unusual on old diesel engines that are pushed hard to run heavy camper vans up hills and on motorways. If you see white sludge, insist on a compression test which can also reveal a blowing head gasket.
Hey up, thanks, nice and straight forward. What a out the inside though, or the Habitation as my service engineer likes to call it as he hands me the bill?
Mind your back lifting those camper vans , or you could end up in hospital with the bloke who fell of the ladder in your other video ,ha ha thanks for the humour 👍🚐