'95 540i with 88k miles runs superbly and smooth, but since I changed the oil about 1k miles ago it now wants to blow out a puff of smoke on initial start up after it's been sitting overnight. I used Pennzoil 15-40 oil and a replacement filter from BMA. Wrong oil or just coincidental?
Also, for kicks I just took out all 8 spark plugs. The front 6 look good but the 2 in the back (one each side) are black. Comments?
Again, the car starts and runs great but I don't like the recent puff of smoke on start up.
Rick in Ohio