When to rebuild?

[JOHN COOKSON]

Chris
I didn't reread the thread. Do you have any restriction on the bypass? If you have a late model engine valve between the tee fitting and thermostat would help control the temp and give you a bit of reserve cooling capacity. Also are you running with a thermostat? If so try removing the thermostat and the engine will run cooler.

TRUE GRIT

[roadnsky]

Chris-
Is there a reason you're aiming for lower running temps?
The temperatures you've listed are actually pretty normal for a RAW water cooled A4...

[Nanook]

I looked up the MSDS on BB and it is 85 percent phosphoric acid:

https://doc.jamestowndistributors.co...SDS-1208-M.pdf

No kidding. Well, for goodness sakes, don't let it set too long. I wonder why their documentation says you can leave it for a while with no damage.

[Administrator]

Hazardous ingredients : Phosphoric Acid 85%
Approx. concentration. (%) : 5% -20%

Doesn't this mean that the product contains a 5-20% concentration of a solution which is 85% phosphoric acid?

Bill