I used one of the new rubber/plastic/neoprene seals in my 235 and so far so good. It is true that oil leaking from the valve cover will make you think the RMS is leaking. The same with the oil pan. I replaced the front seal on another 235 and there was still oil dripping on the ground. I pulled the pan to tighten the two bolts that go thru the bearing block and discovered that my gasket making left a small void in the semi-circle part of the front of the pan. I think it is best to clean everything off before you start wondering where the oil drip is coming from.
