I have used Sierra for about 3 years, hoping to get
around to flushing it soon...

No problems as of yet.  It relies on propylene glycol
instead of ethyene glycol, and is phosphate-free.  The
PG has a slightly higher viscosity, and feels more
"lubricious" than EG.

I am hoping it gives longer life to the internals,
only time will tell.  No particular science behind my
preference though.

Very low toxicity is the hallmark of PG antifreeze.
Two ounces of EG antifreeze can kill a dog, one
teaspoon can be lethal to a cat, and two tablespoons
can be hazardous to children.

Steve Frisbee
85 Westy GL
Reston, VA

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