Originally Posted By: BuickGN
Originally Posted By: CATERHAM
Originally Posted By: BuickGN
Originally Posted By: Ben99GT
I think 10w30 is usually a more "stable" viscosity in most cases, but when you look at RedLine oils, their 5w30 doesn't give up any NOACK or HTHS to their 10w30.
With oils like PP, SynPower, etc. there is a notable advantage for the 10w30s. Their 10w30s are less volatile and less shear prone, I'm assuming this is a result of the VIIs.
Agreed. If I could find out if Redline 5w30 also uses no VIIs, I might try that since there would seem to be no downside.
You could give Dave a call at Red Line and get a quick answer, but I believe RL's 5w30 uses lighter base oils that their 10w30 and therefore does contain some VII.
I've run both RL grades and in practice I can't tell any difference between the two grades; they're just too close.
I'm going to have to call him and quit being lazy. I can't run an oil with VIIs because this car is an experiment of running a car for it's entire life span without VIIs and on a heavier than specified oil. I'm very curious to see what the ring lands look like when it gets torn down.
I was mistaken, RL's 5w30 doesn't contain any VII, their 0w30 oil does.
To quote Dave at Red Line, "Our 5W20, 5W30 and 10w30 do not contain any VI improver. Our 0W30 does contain a shear stable VI improver. Just some of our very broad viscosity oils require the thickener."
Which begs the question; if you can formulate a 5w30 without VII's and with the same HTHS and 100C vis but with a higher VI than your 10w30, doesn't that make your 10w30 product obsolete?
I think the answer is yes technically but no from a marketing perspective. I suspect the 10w30 costs less to formulate, therefore your profit margin is higher since you're selling it for the same price as your 5w30.
Even the best 5w30 dino's are very shear stable. Conclusion, I think 10w30 is pretty much an obsolete grade.