Below is a list of the full syn oils that I have used over the last few years in my various cars for oil changes. This thread conversation is not about oil changes, it's not about which oil is better, or which to use, not is it about how long of a change interval is used. This thread is an observation. I want to start a conversation and opinion, and maybe some facts if someone knows more than me about these oils, as they are advertised.
- Castrol GTX (White jug)
- Mobil 1
- Castrol Edge (Black Jug)
- Valvoline Advanced
- Is 5w-20 becoming an obsolete oil viscosity? (I don't think so)
- Is there something inherently incompatible with 5w-20 viscosity oil and the Dexos spec? (I doubt it)
- Did all three of these oil makers collude to not get approval, in order to save on GM licensing costs? (a conspiracy maybe??)
- Some other reason? (your guess is as good as mine)