The OEM valve guide seals for the OM603 are brown and green with no designator showing what is supposed to go where (a piece of paper isn't that expensive...). Which is intake and which is exhaust? I see information posted in various places (this site included) saying both ways and that can't be correct.

FSM says green is exhaust and brown is intake. Does that still apply today? Who knows because there's nothing included with the new ones?!

My car currently has green on intake and brown on exhaust, and if that is incorrect, I strongly suspect that is my oil consumer. If I take the car out on the highway, I'll suck down a quart ~500 miles. Bottom end is solid, almost no blowby to speak of, certainly not enough to lift the cap even if the breather is blocked up. Turbo pipe is dry. Head gasket isn't leaking and compression is good. I'm out of ideas and notice that this evening when I had the cam out to swap lifters (old ones were getting noisy).

Of course the $64M question - can the seals be changed with the head still installed on the engine? Is there a good writeup somewhere how to do it without screwing everything up in the process or dropping a valve down in the engine?

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]