Rinkle_Stinkle wrote:Ok so just learned something... I was told( not sure who) the the W meant weight.... I didn’t verify the information so I never discovered that was wrong. So now I understand what a 0w-40 could actually be better for my vehicle over a 10w-30 as the 0w would have more viscosity at lower temps, the 40 would be better because of the opposite, has more vicosity at running temp.
Am I understanding this correctly?
No you got it backwords.. Viscous means thick.. how thick a fluid is. The 10 or 5 or 0 is how thick or in this case. how thin the oil is at 30f. The 40 is how thick the oil is when running at operating temperature. The lower numbers are based on temperatures at 30f i believe. And with these sub 10f temps im getting here where i live i opted to go for the 0-40 jist to try it. Plus mobile 1 in lab tests and tests by people on youtube has a much better pouring rate then other oil brands of the same thickness.. Like royal purple 10-30 vs mobile 1 10-30 the bottles on one test i believe were chilled to something like 0f and then flipped tigether on a little platform so they get flipped together.. And the royal purple was like honey.. And the mobile 1 flowed instantly.. The walmart brand didnt even come out lol.
So oil is not oil.. Even if they say 10-30 they are still different. After i saw these videos i was sold and tried to find 5-40 but i couldnt. But i did find mobile 1 0-40. Its a european formulated oil but so far with the zddp bittle i always use its been great.. The initial lifter tapping i had using my old oil is gone. My engine has a weird tapping it does when cold. I drive like half a mile and it goes away. When its very very cold in the winter the noise is even worse.
After getting this 0-40 the tapping is gone when i drive 15 feet and this is when the temps were 7f out. And when the engine is very hot and driven my oil pressure at idle in gear is 20psi and 55 driving Which means the 40 is doing its job. When i use 10-30 my oil pressure is more like 10 at hot idle in gear and about 45-50 driving.
so yes the low number is viscosity when cold. The high number is viscosity when hot. In cold temps you want a lower viscosity for initial startup and driving a cold engine.
20-50 is rediculously thick oil... I wouldnt use that oil unless i had litterally no oil pressure. In virgina it can be 90% humdity and 100f out.. In the summer i use 10-40.
Ppl might think im nuts for going 0-40 but its working great for me and my tapping in cold weather goes away in 10feet of taking off.. not 1.4 or half a mile like it used too.
Also some oils have better sheering resistance.. Meaning how well they stand up to sheer. The oil alot of people like using for some reason is that diesel oil called rotella. Its sheering resistance is terrible though and when the oil is tested for contaminants its actually really dirty oil compared to other brands. It also has very low levels of calcium.. Something gasoline engines need and diesel engines dont.
So why people put that junk in their gasoline engines is beyond me. Also rotella is not certified for gasoline engines anymore. Fyi calcium is a corrosion inhibitor gasoline combustion is very acidic so oils formulated for gasoline engines have high levels of calcium.. Diesel oils as i said have less of it. So in the end youre only harming your engine more by using a diesel oil.. specially when carburetors are known for dumping gasoline in the oil