I'm not sure If I'm picking up your tone incorrectly here... but I never once said that the FEO Ultra was a Group IV... I actually stated that it was very unlikely. I just asked if anyone could confirm it, nor did I state Castrol was the producer... CALTEX is the producer. Hence the Star...Originally Posted by Fredoops
Also... No one said anything about Honda having their own "liquid engineering lab" nor did Honda themselves say it. Of course that is how Honda Oils would be developed. Honda would give them a specification sheet with acceptable variances in relation to Kinematic Viscosity, Viscosity Index, Base Number and Volatility etc. and of course that it would be based on a Group III. Then they would use their own run of the mill base stock. The main advantage is that the viscosities etc. will always suit that recommended by Honda themselves, even if it isn't completely "engineered" by Honda.
You shouldn't be 90% sure that Mobil 0w40 is a Group IV you should be 100% sure. Any 0 weight oil MUST contain a majority of Group IV base stock otherwise it won't meet SAE standards for Film Strength, Volatility etc. Also from what I heard it's almost impossible to get a 0 weight oil from Dino oil without extensive refining/additives which in the end make it cheaper to use a Group IV base stock.
This is of course true, the reason why I stated he is almost paying $100 for a group III as I'm unaware of a Honda Engine (unless internally built/track use) would use a 0w40 oil. Unless you had a built engine that required a 40 weight and you use a 0w weight because you live in a cold climate (ie. below freezing point). Considering in Australia none of our major/populated cities have "cold climates", I assumed he was referring to the 5w30, which is based on Group III.
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