Where are coolant drain plugs on 560SL?

[downeyjc]

I want to change the coolant in my 1987 560SL. I know how to drain the radiator, but I understand the block needs to be drained as well. The service CD indicates there are two drain plugs on the block--one on each side of the engine, near the motor mounts. I'm not sure I've properly identified them. I see two possible choices--a 17mm bolt that threads into the side of the block, or a 6mm hex socket that screws into the block. Neither looks to be very accessible. Anyone know for sure where the plugs are located? Appreciate any help....John Downey

[Shooter]

It's the 6mm hex heads- the ones that point straight up. Don't take a bath getten them out . A long allen wrench is helpful. Do not remove the 17mm head bolts in the side of the block, bad things can happen.

[downeyjc]

Shooter: Thanks for the quick response. I kinda thought the hex head bolts were the ones. I tried to back one out last night but it was really tight--thought I would post a message and verify before breaking it loose. Looks almost like an aluminum plug--sure hope it isn't seized. I like the hex bolts when they are get up around 10mm or bigger--have a hard time getting necessary torque on the smaller ones. Guess I'll get after it today. Thanks again. John Downey