Originally Posted By: BuickGN
Read the last line in the first post in the first quote. He states that he also used a 20wt dino too. I think most people missed that because they saw the first few sentences and started flaming away.
I saw that. Two things in response:
- No 5w-20 is fully dino. It has to have some synthetic component to keep volatility down.
- Castrol GTX 5w-20 is slightly thicker at 100 C than Mobil 1 5w-20.
The fact remains that he is still making a blanket statement based on only three oils, and on top of that they aren't even good samples for what he's trying to demonstrate.
This isn't to say he's stupid, of course. He could be a totally competent engine builder and still make this kind of mistake. I work with scientists for whom this aspect of experimental design is at the core of their livelihoods, and they still do it from time to time. It's why you always have to look at things with a skeptical eye.
Originally Posted By: BuickGN
I hope to get him over here, I would love to hear more info from a guy that has been into hundreds of these engines. IMO, I put more value into his teardown results than a UOA to determine the best viscosity of these popular Honda engines.
Agreed.