There are several on the market now that are phosphate and silicate free
and are "long life". I am currently using the Havolin brand (please
excuse if I have misspelled, I don't feel like running out to the
garage). I believe there were at least four brands last time I was in to
see the Brothers Three. Cost: <$6>$7 p/gal ( is that right? or do I have
it backwards?)

Steve and Jo Ann Wacker
San Marcos, Ca.