Is it safe to use pure isopropyl alcohol as a...

coolant, fluids, additives
Dear Tom and Ray:

Is it safe to use pure isopropyl alcohol as a gas line antifreeze? We have been using NAPA gas line antifreeze, which says it contains 99.9% isopropyl alcohol. A 12 ounce container of NAPA costs me $1.07. Pure isopropyl alcohol is 39 cents a pint in my local drug store. Can I use that instead?

RAY: Sure you can. If you have a fuel injected car, isopropyl alcohol is the recommended gas line antifreeze (methyl alcohol is recommended for carbureted cars).

TOM: In both cases, the alcohol absorbs moisture that condenses in the gas tank and fuel line. And if you really feel you need this stuff (we never use it ourselves), you can use the isopropyl alcohol in the same ratio recommended on the NAPA bottle (about 12 ounces to ten gallons of gas).

RAY: And for a third of the price, you've got 99.9% of what's in the NAPA bottle. The other 0.01% is a secret ingredient NAPA throws in. We haven't been able to confirm this, but highly-placed sources tell us it's desalinated prune juice.827
Tags (Browse All)
coolant, fluids, additives

You must be logged in to leave a comment. Login / Signup
Support for Car Talk is provided by:

Donate Your Car,
Support Your NPR Station

...and get a tax break!

Get Started

Find a Mechanic

Promo tile

Rocket Fuel