I read some
articles on AERO engines, which have to be more reliable than car engines obviously, and their owners who are also pilots are serious engine geeks not like semi-enthusiasts like me. Some interesting points:
1) Modern multi-viscosity oil offers superior lubrication and longer engine life than old-fashioned single-weight oil.
there are 2 `good things' about multiviscosity oil, that they are better lubricants because they thicken up (relatively - the viscosity decreases logarithmicly but less steep slope) in higher temps, and because they don't thicken up too much in low temperatures.
Multiviscosity oil has 10% polymers called Viscosity Index Improvers, which attempt to increase viscosity of oil when it heats up.These VI polymers are NOT lubricants. Basically for the same volume of Multiviscosity oil you only get 90% lubrication capability of single weight oil.
And Singapore doesn't have low temps when the oil thickens up too much to flow effectively. But we have 0W oils which is like very nicely flowing at low temps like room temp. THAT's supposed to be good because it seems that when you start the car, the oil will flow fast. But my question is - single viscosity oil which is just as think at room temps than at high temps. The oil supposed to stick to the piston walls and your piston ring, so when you start, isn't it better than 0W oils which like flow down the walls of the cylinder walls leaving them naked? Doesn't that cause corrosion?
2) The less oil an engine burns, the better.
Oil supposed to line the cylinder walls. If you don't burn any oil, doesn't it mean that too thin or the lube system has a problem that the oil is not reaching the top of the cylinder? A properly lubricated cylinder, the entire wall is coated with oil, so surely some oil will burn.
3) The cooler the engine's oil athe better
OK when the oil too hot the oil breaks down and therefore too hot is no good. But too cold got super issues. If too cold, let's say your oil only at 90C, that is below the boiling point of water. Because in my country, air is 80-90% humidity, there's a LOT of water in the air. Once the engine starts to cool down, the water condenses. It will go into the oil sump. If the next time you start your engine still like 90C kinda temp, the water NEVER gets boiled away much, and your oil gets thinner and thinner and your engine will have less and less effective lubrication.
Linear Mode
