With having the knowledge that my 2006 (R230 SL 350) had the possible balance shaft issue I wanted it corrected as I wish to keep the car. Following a year or so of personal research and numerous phones calls to various garages I finally received a great recommendation from an old long standing friend, he too an R230 owner. He kindly advised me to speak to Mr. Nigel Seopardie of NJS solutions. Following that first phone call and in depth conversation with Nigel I was sold! He is a true GURU when it comes to MERC! He is an amazing man and a total professional in his field. I.M.I. T. Eng.