Bmw e46 330i saloon with an SMG box Think my head gasket is on the way out or gone as I have sludge on the filler cap and every now and then when I check the dipstick. Had inspection 2 done about 2 months ago (same problem) where he said it might just be breathing heavy. Not a problem until I check her oil level 3 days ago. Then 2 days ago a cloud of blue smoke from the back pipe's but has not happened again since. Seems to be running spot on. Any Idea's Folks Cheers the Cat....