Hello everybody. I'm back into the Mercedes fold, for now. I just piked up a '98 E300 with the OM606 turbo. I'm doing maintenance on it tomorrow and want to investigate a few things while I'm there. I'm doing all of the fuel lines, oil & coolant chain (trans fluid has already been done, I replaced the speed sensor plate not long ago - bought this from a colleague, so it's not a complete stranger to me), fuel filters, rear window regulators...

Does anybody have a diagram or p/n's for all of the PCV stuff on top of the engine? It's all oily, so I assume it leaks. if it's all cheap enough I'll just buy it all new.

I want to delete the EGR. Does the ECU use the MAF for anything besides EGR? Is there a tuner that can turn of the codes for EGR?

Diesel purge. 1 can or 2? Hooked up the way I've seen in some videos putting 2 hoses into the bottle, is that cleaning the injection pump too, or just the injectors? Is there anything I should be concerned with in the tank?

Tuning/software. Who are the recommended tuners around here? Not going for big HP, but a few more ponies and a few mpg gains would be nice (and getting rid of the pesky emissions equipment, of course).