I know this is a topic that comes up every now and then. It's like....'I favor chevrolets over buicks' etc. I have been using Castrol Syntec in all my cars for years. I do the same with my 01 Proton and have now switched to their 'europeon formula' 0W30 synthetic which is supposed to be a 'group 4' oil and NOT a 'group 3' synthetic oil. There is a domestic Syntec 0w30 but it's not a group 4 oil. Since the difference is in what's in the base stock of the oil, it's supposed to be better for longevity, etc.
I do get about 1.5 miles better in mpg than the 10w30 Syntec i was using prior to this, but since i change it around 2500 miles anyway I figure i'm probably throwing money away....but i do have that good 'insurance feeling'.
It may be just a feeling.
Has anyone else experimented with, and have opinions about, other synthetic oils or just synthetics in general. I have been a firm believer in them regardless of cost.
Let my know your feelings,
Scott