There I was toying with a 7 series BMW on the A5. Pass it at 110, come to a hill, ask for more and there's a little "phut" and no more power, ease off the gas and oil streams through the bonnet vent onto the windscreen, pull up asap. Small oil fire under the bonnet soon goes out. Look under bonnet and oil filler cap has blown off. Replace it and as soon as the engine tries to fire it blows off again.
Call RAC, and wait for tow truck while sitting in BMW eating mince pies and watching telly.
If I'm very lucky, it's just the head gasket. Otherwise, likely to be a holed piston.
Call RAC, and wait for tow truck while sitting in BMW eating mince pies and watching telly.
If I'm very lucky, it's just the head gasket. Otherwise, likely to be a holed piston.