RMS or Rear Main Seal – Both the 986 and also the 987 Boxsters are very vulnerable to the rear main oilseal failure, now this is very expensive to carry out a repair as the whole transmission and flywheel has got to be removed to fit the modified replacement seal.
The consequence of RMS failure is generally nothing more serious than an oil leak left on the garage floor. The repair can be delayed until the vehicle warrants a much bigger job doing, say a replacement clutch. But this does depend how much oil you`re losing. But, it’s well worth getting an Independent Porsche specialist to assess the vehicle for faults or any oil leaks before you commit to buy a used Boxster.