How much coolant do I need for a flush?

I know to mix with distilled water, I just want to know proper ratios. By the way thanks to all for info on tune-up. It was still a pain, but all the info was absolutely necessary and much appreciated. Also Yorgi, your brake job DIY is phenomenal!

Check out this post.

I would HIGHLY recommend you use the blue coolant from the dealer. The dealer coolant is very high quality - phosphate free, very good rust inhibitors, etc.... you don't want to cause a premature rad failure ($1,000+) or even worse, a coolant pipe failure ($2K to $9K).

BMW coolant is cheap insurance.

If you are bored, you can read this big thread on coolant types.

I concur with Yorgi 100% on the use of BMW coolant/antifreeze. If you are going to do a total system flush 2 jugs of the OEM coolant mixed 50/50 with distilled water should fill her back up properly.

If it doesn't look like the photo below then it's not the BMW coolant/antifreeze which we suggest.


ECS Tuning

Thanks for all the info. Im changing thermostat and wanted to flush at same time. I'll pickup some at dealer today. Great info owners manual said nothing?

I have an 05 645ci and I flushed yesterday but used a total of two gallons. 1 gallon BMW blue antifreeze and 1 gallon distilled water, water level is fine.

Originally Posted by Superhart1977

I have an 05 645ci and I flushed yesterday but used a total of two gallons. 1 gallon BMW blue antifreeze and 1 gallon distilled water, water level is fine.

Did you drain both the rad and the engine block, or just the rad?

Is there a step by step DIY video posted to flush a E63 Rad?

Thanks.

Originally Posted by pcm888usa

Is there a step by step DIY video posted to flush a E63 Rad?

Thanks.

It's very easy.

Here are the TIS draining instructions.

Refilling is even easier, the system self bleeds.

Thank you so much. Will give it a try. I saw some posting about putting a garden host and back flush the radiator. I guess not a good idea?

Originally Posted by pcm888usa

Thank you so much. Will give it a try. I saw some posting about putting a garden host and back flush the radiator. I guess not a good idea?

Yes bad idea. I would not put tap water in my cooling system. Some of the tap water will remain after the flush. The flush is not required in the first place if you stick to BMW coolant, which does not gum up like cheap coolant typically sold in North America.