Originally posted by Hristo Tomov
Do you know some site with oil grades charts or pix and also some info for the grades , like to how much hot (not cold ) the different grades can go (for example 5w-30 - to what high temp is good - like is it OK for use with under 100deg.F heat (or for the CA SF Bay Area climate winter mid 40F and summer mid 90 F )?
Go to the oil-company sites and check their tech sheets. They list this information. For example: