legacycentral bbs

Well,
I'm getting ready for an oil change and I'd like some
recommendations on the weight of a full synthetic oil for the winter
here in Colorado. My '91 Legacy turbo with 181K has been running
Amsoil 20W-50. I was looking at a Castrol 5W-50 for winter. Is that
a good bet or is there a better alternative? Thanks for your guys
support in this,
Andrew Mouser

Mobil 5w-30. Why? NO VISCOSITY MODIFIERS ADDED like the others you
mention. Realize that these polymers are a consumable item in the oil,
so the more there are the more drastic the viscosity will drop over
time. On average oils with a larger difference (5w-50) have the most of
these modifiers, so they will "fail" sooner.

Whatever preferrence of oil brand and type, choose that with the
smallest difference.

Thanks for the response, I'll check out the Mobil
5W-30.
Andrew