Hi mate, I think the piston rings are bust on the jeeps engine. It uses oil, there is back pressure coming outta the oil filler cap, it smokes when I've got my foot to the floor (white smoke). I think I may have noticed a loss in engine braking too. There's no cross-contamination between coolant and oil. Can you help?
BTW Many thanks for sorting the Astra out so quickly, runs smooth as a babys bum now! and it feels like I've hit a brick wall every time i touch the brakes!