A mechanic who thinks the SDL is a V6?

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)

Perhaps his listings for cars are just typed in to fill-in-the-blank type categories. Such as Cylinders V___.

I would say go with what you want to spend. If you want to go cheaper, get the SD. If you want more expensive, get the SDL. Or you could lowball offer both and whichever person takes the offer, you get the car! Or I guess I could say whoever comes down the most.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD