why would you want to? Yes you could, the viscosity will average out .
10W30 in the winter 20W50 in the summer castrol GTX is a real good oil, need to use A/C DELCO FILTER.
10w30 in the winter time---- 20w50 in the summer time.
Use 10w30 in the Winter and 20w50 in the Summer.
Yes.
20w50 castrol
castrol extra 20W50
20W50 is the " thicker " oil
Factory recommends Castrol Synthec Blend 20w50
You can use 10W30 or 20w50.
Use 20W50 oil (Castrol makes it) in a type 1 VW.
It depends on the climate you live in. Consult the owners manual for the correct weight oil that you should be using.
10w30 or 20w50 is great