Abe G,
This is a very sensitive issue that has been beaten to death in several pages on this forum. My engine's construction is all aluminum, and I've read from some really, really experienced techs on and off this forum that the green coolant isn't good for the aluminum construction used by M-B. It may work for other automakers, but not for M-B. The green coolant drained from my car wasn't rusted or dirty at all. It was very clean, something I am very happy about. However I don't feel like I wasted money or time in trying to flush the system to replace the green coolant with the M-B coolant due to two reasons: 1) with these high-dollar machines, I am not willing to take any risks. I can understand your own point of view, and to each their own. But I am not going to run any M-Bs I own with green coolant. Simple as that. I know you've had success with green coolant in your 450SL for five years and I wish you many more years of trouble-free ownership of the car, but remember that you have an all-iron engine with very few aluminum parts that are the parts most vulnerable to the green coolant. I own also own a '84 300SD that has a cast iron engine but I use the proper M-B coolant in it because I know that there are some aluminum parts in the engine, such as the housing of the water pump, etc. 2) From the service records, I saw that the car's cooling system was last flushed three years ago, so it was due for one anyway.
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Originally Posted by Mike Richards
I'm not sure if you're saying the head is striped or the plug is frozen in place?
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Thanks Mike.Actually, it the case happened to be both, but I'm not sure. It seems frozen in place, and I know it is definitely stripped. Either way, I'll check out the URL you gave me as I eventually have to replace those drain plugs for the future, in case I keep the car long enough to do another coolant flush during my ownership.