My wife and I are going to test drive a 1987 300TD Turbo tomorrow morning. Is this 603 engine, the same one they put in the SDLs and was prone to engine failures and rod bending? I have a MB production numbers book and it list the engine for this TD as being a OM603A. Whereas the engine for the 300/350SDLs were labeled as OM603. Is there indeed a difference. Are there any problem areas with this particular engine, other than it not liking to be overheated? Also, where is the glowplug relay, so that I can check out the glowplugs with a meter.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member