G'day, all. Just got through washing and detailing the 500E after various holiday travels, and right now it's sitting gleaming and happy in a nice warm garage (to beat the ugly weather outside).

I'm doing advance planning for the next round of maintenance, and I found this old thread which talks about factory mods to the oiling system on the M119 engine:

500E still Racka Racka's on cold start up????

This particular M119 is (probably thanks to excellent PO maintenance which I'm endeavoring to match) demonstrating absolutely no racka-racka noises or other sounds of oil woe. Even on dead cold starts after sitting for a week, it's perfectly quiet.

Nevertheless, I intend to keep this car for a long time and am a great believer in preventative maintenance. My thinking has been that I will fit in the various oiling upgrades at times when they mesh with other scheduled tasks -- I've got the part numbers for the oil filter checkvalve and the oil pump relief valve. Checkvalve goes in at the next oil change.

I'm a bit confused about the stuff that goes up in the heads, though. There are references to updated parts, variously dubbed "bridge connectors" and "oiler tubes" and "O-rings".

PartsShop shows "OILER TUBES" for part code 119 180 02 66, but doesn't say anything about how many are needed. Is that code for a set of tubes or a single tube or what? Are the O-rings integral to the tubes?

I'm going to pull the valve covers sometime in the next month or two and have a look around. Last time I did this (PPI), the valvetrain looked impeccable, and I assume it'll be the same now.

But I may as well just do the tubes while I'm in there if I can sort out what to order. Any words of wisdom? Removal and installation clues?

s/b

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