This owner thought it a reasonable approach to save $6.00 on propylene glycol antifreeze. He decided to suck just two gallons of -50 PG into his expensive engine. Once he "saw pink" out the exhaust he immediately shut the engine off.


Sorry to break it to you but merely "seeing pink" arrive at the aft end means SQUAT unless you previously KNOW exactly how much it takes.. If in doubt please MEASURE the concentration coming out the exhaust by catching it in a cup and then measuring it with a sight refractometer. Alternatively spend the extra $$ & suck in a couple more gallons of PG. The concentration coming out the wet exhaust should match what it went in at.


This owner froze and split his expensive heat exchanger. It cost a hell of a lot more than the $6.00 he saved on antifreeze.


This is what remained inside the HX in the spring. Please understand that when you suck in a gallon of antifreeze it does not simply displace 1 gallon of water. IT MIXES with the water already in the system. Pre-diluted propylene glycol should not get diluted any further...


You may get away with saving a penny in the mid Atlantic region but in the far North you can run into serious trouble.