Can you use blue devil head gasket sealer without removing thermostat?

Asked by GuruRVNBT Feb 05, 2020 at 08:08 PM about the 2005 BMW 5 Series 530i Sedan RWD

Question type: Maintenance & Repair

Do you have to remove thermostat when using
blue devil sealer?

9 Answers

41,160

I would not use Blue Devil on any car. Replace the part or parts that are leaking. You will only seal the leak for a short amount of time, and then the rest of the system will be gunked up. Then you will have more work down the road.

4 people found this helpful.

Follow the instructions but like Dolby says I would never use such crap in my engine.

4 people found this helpful.
157,515

This is the only stop leak product that I've ever seen work BUT you MUST follow the instructions on the bottle exactly to the letter!! Hope that helps! Jim

4 people found this helpful.
120

It would be nice if someone would have just answered the question

12 people found this helpful.
157,515

Yes, the thermostat must be removed. That is on the instructions that I said to follow to the letter. Jim

4 people found this helpful.
20

I used it in my other car and my daughter put over 100000 miles on it before I started driving it. It works great. We use it in diesels at work too.

2 people found this helpful.

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