I use 15-40 in the winter mos. supplimented with a quart of MMO, and
20-50, in the summer.
Seems to be working out alright.
I haven't had any starting problems here in the Chicago area, cause when
we get the occasional artic blasts, I just plug my lower hose heater in.
Fast starts, fast heat.
And I keep the defroster control on, and what little heat that gets up
front keeps my windshield pretty frost free.

Later

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Terry 85 GL