[C320-list] Winterization Plumbing on my C320

[Troy Dunn]

Using RV antifreeze (the cheap $3  PG/Alcohol mix) in your water supply
plumbing is probably fine, although most shops would not recommend it.
Not sure why.  Using this RV antifreeze in your engine is a bad idea.  For
the engine buy PG only AF mixes.   If the label says the antifreeze is
combustible it has alcohol in it which can damage seals and is actually
corrosive for some parts of the engine.

FWIW

Troy