they are rated on a different scale

 

i know what the oils pourpose is in an engine.
and i still stick with my statement that lower number oil is thicker.
since at colder temps oil thickens and higher it thins.
also for example 5W30 is only a 5 oil at 0 degrees F and is a 30 only at 210 degrees F. after that who knows what kind of oil it is. and on a cold start the oil will only be a 0,5, or 10 assuming it is 0 degrees out if its warmer its anyones gues what kind of oil it is. and it will only be a 20,30 or 40 at 210 degrees and again after that or before its anyones guess what kind of oil it is.
theres too much to know about oil it could easily take well over 4 hours to explain it all like flash and pour points. what temp it burns and what temp it stops flowing respectively.

 

I'm not even going to get into a debate with you on this subject. You need to go to http://www.bobistheoilguy.com/ go to glossery and look up viscosity. While you are there read some of this guy's research it's good stuff. You'll learn a lot. BTW 4 hours will not even scratch the surface.

 

right thats what i said it would take well over 4 hours to teach all about motor oil. and i checked the site and in the glossary it says this.

Viscosity Index

An arbitrary scale used to show the magnitude of viscosity changes in lubricating oils with changes in temperature. Oils with low VI number such as VI=0 ("zero") have high dependence of viscosity change on temperature. They thicken quickly with decreasing temperature, and thin out quickly with increasing temperature. Oils with high VI number such as VI=200, will still thicken with decreasing temperature but not as rapidly, and also will thin out with increasing temperature, but again not as much as low VI oil.

VI number can also be "negative"

Tables found in ASTM Method D 2270 are widely used to determine VI number.

However, VI does not tell the whole story -- it only reflects the viscosity/temperature relationship between temperatures of 40°C and 100°C. Two lubricants or base oils with the same VI number may perform dramatically different at low temperatures in the -5°C to - 50°C range.
hence lower number oils are thicker like i said.
and i agree lets not turn this into a debate.

 

[QUOTE=Black305RS]right thats what i said it would take well over 4 hours to teach all about motor oil. and i checked the site and in the glossary it says this.

I do not believe you are using the full context of the information given. I'm not trying to beat a dead horse but here is a very interesting article I found that also explains oil properties: http://www.f-body.org/oldfaq/html/tech/sect2.html If lower numbers mean thicker oil why did engine manufacturers go to lower viscosity number energy conserving oils ie. GM with 5W30 and Ford using 5W20?

 

imsticking withwaht my teacher told meback in engines class thats that.

 

either your teacher misspoke or you misunderstood him. The higher the viscosity number, the harder it is to pour, hence being thicker. New mazdas (fords) use 5w20, this is pretty thin stuff. If you want to see for yourself, go out to your local parts store pick up some 0w20 (almost water) and some 15w40 (or higher if possible, pours like honey). Now pour out both bottles into a suitable container, your motor, another bottle, lawn, mouth, whatever. Bet you will figure out which is thinner real quick. Let us know what you find.

 

For a Created motor .........MOBIL 1 performance like the 15.50 .

IMO

Mark

 

Mobil 1 10-30W and an K&N HP 3002

Motor is as clean as a whistle and excellent oil pressure even in hot weather, no build up of anything and no leaks.

I used Castrol 10-30W when I broke my motor in and then switched to Mobil 1 after 500 miles or so. I have used it the last 3 1/2 years with no problems.

 

I'm using Quaker state High Mileage (10 30). Does that stuff actually help? What's the difference.

 

i belive that thr quakerstate high milege oil is not api certified which means its not good.
to check api(american protroleum institute) certified/rating there should be a donut on the back side with a rating like SJ or SF.

 

High Numbers = Thicker. Simple as that. As the previous posters said...either you misheard him, or you AND your teacher are misinformed.