in. We did drive it around during christmas break and once or twice
during the fall and in February when we were in the city. We do use it
during the summer for travel and taking care of business. That should not
have caused an "internally" blown head gasket.
I had a long talk with my friend who owns a machine shop when I blew a
Toyota head gasket. In one of our cooler Februaries (SoCal, so it
doesn't get THAT cold!) He said the kind of use you describe is exactly
what causes a LOT of blown headgaskets, regardless of make.
His explanation was that colder weather causes much more
expansion/contraction of the heads, gaskets, etc., and what happens is
you go out one cold morning, fire up the engine when things are
contracted, therefore "looser" than usual, and probably blow the gasket
within a few blocks. He pretty much had my situation described
On the bright side, he also said if you surface the heads the first time
you blow a gasket, the chances of another blown gasket go WAY down. He
said that's cuz the metal has pretty much done its shape distorting
expansions and contractions--"cured" for lack of a better term--and now
will hold a flat surface better. Again, he described perfectly what I
experienced once the engine was buttoned back up.
Since the Subie engine has more aluminum than most, it stands to reason
perhaps there will be more "motion" of the metal in that engine,
especially in widely varying temps. It's anecdotal, of course, but my
Subie needs coolant about once a week during the winter, once every
coupla months once it gets warm and thru the summer.
Hope yours treats you well now that it's been fixed!