Possibly S38, it is so old I would never see it in the dealership...but I do not agree about the lack of vacuum in the plenum, because I have experienced 1st hand that vacuum is created in the plenum...as the pistion travels downward it creates a large open "hole" which creates a pressure differential in which air rushes to fill as soon as the valve opens...you can actually feel, hear, and sense a change when you pull the oil fill cap off most engines. This is why I strongly protest....Pull the oil fill cap off a, for example, 2002 X5 M54B30 the RPM changes, and if you put your hand over the hole, you can feel a "suck" of course you also make a big oily mess in the process...This is something I have actually seen first hand and felt with my own hands...This I know for a fact. I do not tend to "guess" here, I'm sure you can even admit there are far to many "stupid people" in the world that would take guesses far to litterally and screw things up...like I said, the S38 is way too old for me to see on the dealership level, and the assumption was made that it would be just like any other engine on the market on any line.
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