I bought the car with about 104K on it. I changed the oil every month with Rotella 15w40 dino (about 3200 miles) I was going down the Thruway at about 75mph when it began knocking and shaking (145K miles). Had it towed home. Pulled the engine and put in a 1982 671.952 out of a 300D ($500). I use Rotella 5W40 synthetic in this engine as Mobil 1 is hard to get around here.

I have been meaning to get into the original engine and see what if anything broke. It still ran, but without any power and made lots of nice black smoke
It did not loose any oil so nothing punched through. The block and pan are intact looking at it.

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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad