[jkarolyi]

>The 10 is a "heavier oil" whereas a 20 is thinner.

Thanks for that info...I always assumed the 20 was thicker! I run Castrol 20W50 High Mileage oil in my 140K+ mile Carrera. Would 10W40 be a better oil for a high mileage engine (that uses a little oil...nothing excessive) in an always-warm climate like SoCal?