"I have a 1991 Pontiac Sunbird LE (2.0). Neighbor purchased it when it had about 8k miles and it has only been driving in town. It has averaged about 4k miles per year over the past 19 years. I am averaging about 1k miles per month, so it sees a lot more driving. It currently has about 83500 miles.
When I purchased it a couple of months ago, the air filter was very clogged and dirty. I changed air filter, pvc valve, thermostat (which had been stuck open for who knows how long), oil filter etc... I added Auto-Rx and am about 1500 miles into a cleaning cycle. I drive six miles one way to work and average about 25 miles per day by the time I come home for lunch, run errands, etc.. I was averaging about 22 MPG for starters. Now, I am getting 25-27 MPG. Is it possible that the Auto-Rx is is cleaning the engine up and increasing fuel economy?
_________________________
Larry "
After knowing thermostat was stuck open, I would have done two or three less than 1K oil changes before starting the Auto-Rx.
To late now. Go with it!
Run it hard. Heat it up!