The primary importance of oil viscosity:
"An oils first line of defense is its viscosity (thickness). The ability of the oil film to prevent contact between the rings and the cylinder is a function of an oils viscosity. Generally speaking, the more viscous or thicker an oil, the greater load it will carry."
Looking at the viscosity graphs for oils that are true full synthetics show a wide range of viscosities which means the high viscosity ones have viscosity modifiers added to the mix to artificially bring the mixes viscosity up. But my long standing question, which the engine oil manufacturers can't or won't answer is "Does artificially created higher oil viscosity provide more engine protection or is it done to just make the paying consumer think they are getting a higher quality product? Where are the product tests showing it isn't just another modern illusion?"
If they are adding a lot of viscosity modifiers then it should be reflected in the product price. Motul 800 Road Racing is 16% more costly than 800 Off Road and 800 Road Racing has around 20% more viscosity at 175C (a typical upper cylinder temp). Also Golden Spectro is mostly just Bright Stock, a mineral oil almost as good as group 2 mineral oil, and its viscosity is approaching that of the lowest synthetics which implies it has lots of viscosity modifier added to it and it does reflect in the price that is $10 more per liter than Motul 800 Road Racing.
So if my suspicions are justified then an oil ratio calculator should not go by the promoted product viscosities but by a formula that goes by the % of synthetic and mineral oil in each product, which is what I'm working on now, something that ignore whether or not viscosity modifiers have been added.
"An oils first line of defense is its viscosity (thickness). The ability of the oil film to prevent contact between the rings and the cylinder is a function of an oils viscosity. Generally speaking, the more viscous or thicker an oil, the greater load it will carry."
Looking at the viscosity graphs for oils that are true full synthetics show a wide range of viscosities which means the high viscosity ones have viscosity modifiers added to the mix to artificially bring the mixes viscosity up. But my long standing question, which the engine oil manufacturers can't or won't answer is "Does artificially created higher oil viscosity provide more engine protection or is it done to just make the paying consumer think they are getting a higher quality product? Where are the product tests showing it isn't just another modern illusion?"
If they are adding a lot of viscosity modifiers then it should be reflected in the product price. Motul 800 Road Racing is 16% more costly than 800 Off Road and 800 Road Racing has around 20% more viscosity at 175C (a typical upper cylinder temp). Also Golden Spectro is mostly just Bright Stock, a mineral oil almost as good as group 2 mineral oil, and its viscosity is approaching that of the lowest synthetics which implies it has lots of viscosity modifier added to it and it does reflect in the price that is $10 more per liter than Motul 800 Road Racing.
So if my suspicions are justified then an oil ratio calculator should not go by the promoted product viscosities but by a formula that goes by the % of synthetic and mineral oil in each product, which is what I'm working on now, something that ignore whether or not viscosity modifiers have been added.
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