It will say on the back if its okay for a Benz. I got Zerek G-05. The concentrate was about $11 and the pre-mixed about $14. Oddly.

I just put G-05 in to replace the green crap. It took a lot of work and I SHOULD have pulled the plugs on the back of the engine. But I could not find them. I did not do the citrus. Too cold here to drive around for a couple weeks with it in there.

I got the engine hot. This was to open the t-stat. Then I drained the radiator via drain plug. With a garden hose I put in tap water. It took A LONG time to become clear. I used a glass and sampled what poured out of the radiator bottom. I have a heated washer fluid tank, so I also disconnected those lines. With a rag I put the hose in the expansion tank and used the rag to seal it as best I could around the hose to pressurize the system with tap water. This caused a bunch of green stuff to come out those hoses. I also fired up the car for a bit to get things to cycle through while water poured into the expansion tank and was pouring out the bottom of radiator. In short, FLUSH and FLUSH well. And keep flushing to get all the green out.

I followed by some distilled water. But the tap water here is very pure and soft.

But since I did not pull the plugs, almost 2 gallons of tap remained. So then of the two gallons of 50/50 and one concentrate I only got in the concentrate and one gallon of 50/50. Bad thing, but I tested and it came to a negative 20 degrees safe.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car