@ Jooseppi Luna: Thanks for the pics, clears things up. I'm going to scan some boneyards to see if there's a W123 locally. I might take you up on that offer, but I'm on a limited time frame ATM.

@jake12tech: Zerex, huh? Same brand I use in my International diesel, good to know.

@ngarover: That gives me a place to look - Thanks.

@Mxfrank: Thanks for the links. I check my IDI with SCA test strips - Should I do the same with the OM617? I picked up a Mityvac and vacuum/pressure gauge yesterday. I'm excited to use the Mityvac for bleeding my brakes. No more running a tube into a bottle into the cab and stomping the pedal while watching the fluid flow.

Got the oil and trans fluids & filters, fuel filter, and diff fluid changed yesterday night. The drain plugs on the diff were a pain to get off, I was beginning to think they were reverse threaded. 8-ton bottle jack pushing up on a 2ft breaker bar did the job. Gunna hit the brake bleeders with PB blaster again, do the brakes, and take it for a test drive! Then all I've gotta do is double check the tranny fluid level, and adjust the valves. Over the phone the parts guy at Napa said he'd have to order the valve cover gasket, but when I went in there he actually had one in stock.