I sold my old Mazda van and now have the money to put into the 300D. So what are your suggestions to pro-long the engine of my 150k mile diesel engine. Valve adjustment, new valve job? Timing Chain Check? Everything seems to work fine now. It has all new belts, oil, filters...

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2000 Ford 7.3 Powerstroke 4x4
2006 Mazda Tribute
1983 Black 300 D (donated to charity)
1993 Teal 300 D (160K) Sold
"I love the smell of burnt diesel fuel in the morning, it smells like ....VICTORY"

Semper Fidelis
USMC 1973-1976

I would only adjust valves if it has been a while and check chain stretch while doing it (by eyeballing which may not or not be completely adequate as previously posted). If you get a pro to do it, it should set you back an hour's labor for adjustment and dial indicated chain stretch assessment.

This assumes that all other running issues and fluid changes intervals are fine.

Good luck.

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2008 GL320CDI 6K
1970 280SL 112K
1982 240D 210K (Sold)
1973 220D 220K (Sold)
1967 200D 160K (Sold)
1992 400E 139K (Sold)
1988 300E 148K (Sold)
1987 300D 257K (Sold)
1991 300E 108K (Sold)
1987 300E 131K (Sold)
1978 300D TMU (Sold)
1980 300D TMU (Sold)
MBCA Member

Well, if this thing has even had it's oil changed at 10K mile intervals, it's still a baby. No need to check the chain stretch, but go ahead while your adjusting the valves. Don't fix what isn't broken (ie: valve job).

I am about to change every filter on my 300SDL tommorow just for routine maint. (Oil, (2) fuel, air and tranny).