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Old 07-12-2001, 05:09 PM
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Mike Murrell Mike Murrell is offline
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Join Date: Feb 2000
Posts: 2,357

I searched the archives too. Don't own a 420 but have been considering one, hence the curiosity.

In one post, Benzmac indicated the block as well as the radiator could be drained. When I change my coolant, I remove the T-stat so I can forward/reverse flush.

The 103 motors have a 19mm plug on the passenger side that's easy to get at. Your V-8s engine plug may be a bit harder to get at? If you don't receive anything here, you may need to refer to the 126 CD-Rom.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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