Hey everyone,

Here's a question to the M30 gurus out there. I am experiencing the famous oil leak from the front of the engine. The upper CPS mount bolt is to blame. In the past, I have applied sealant to the shaft of the bolt (not the threads) and the leak subsided. Recently, I disturbed the bolt while changing the CPS and it has begun to leak again. On the web there are two recommendations that are given. 1) Take out the bolt, clean it, apply threadlock and reinstall. 2) Remove the bolt, clean it and seal the threads. I have both threadlocking compound and thread sealant, but can't decide which to go with. Do the threads of the upper mount bolt actually penetrate into the oiled area? Would it be more appropriate to use a thread sealant there instead of plain threadlock? Should I apply any sealant to the shank of the bolt and under the head? I would really appreciate some input from those who've successfully fixed this pesky leak.

Also, I have a little oil coming up around the oil dipstick guide tube. I know there has got to be an o-ring at the base and its probably all cracked now. RealOEM does not show an o-ring on any part diagrams that I can locate. Is there an o-ring there? If so, does anyone have a part number for it?

Thanks in advance!