> The one thing I don't understand is why 20/50 oil would be detrimental to
> road engines, as mentioned below. I have used 20/50 as the standard oil
in
> most of my MG and older Toyota engines, with no ill effects. This is the
> grade that is recommended by the manual. It is only recently (last 15
years
> or so) that the lighter viscosity multigrades have been specified,
> culminating in 5W-30 for my wife's 96 Camry V-6. I still believe in 20/50
> for my older engines, particularly here in California where the
temperatures
> can get over 100 deg F.
I have been using 20w50 since it has been available. I swear by it. But only
in the summer. In the winter I run low winter weight numbers like 5-10w.
when in real cold climates I run Amsoil in the winter.
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