How detrimental is it to...

TypeOne · 01-09-2011, 11:07 PM

Confusion...ugh...

Insert foot into mouth.

:-X

ChrisSlicks · 01-10-2011, 07:43 AM

Quote:

Originally Posted by TypeOne

Oil gets thicker as it warms up. When your car sits and cools down, the oil thins out. The oil is thin so that it lubricates the engine better when everything is cold.

Sorry that's not really true. Oil thins as it gets hotter and thickens as it cools.

The viscosity of a 5W30 at 100F is around 60 cSt, and at 210F is around 10 cSt (higher number is thicker).

I think you were mislead by the numbers. The number followed by the W means that it is a Winter weight, which means it has the viscosity of that weight oil if it were at operating temperature (210F), but doesn't mean that it acts like a SAE 5 weight oil would at operating temperature while cold.

Now with the modern multi-weight oils there are some properties that are built in the help reduce the extremes in viscosity, but not so much that it can ever be level in viscosity or operate backwards.

ImportConvert · 01-10-2011, 08:06 AM

Quote:

Originally Posted by ChrisSlicks

Sorry that's not really true. Oil thins as it gets hotter and thickens as it cools.

The viscosity of a 5W30 at 100F is around 60 cSt, and at 210F is around 10 cSt (higher number is thicker).

I think you were mislead by the numbers. The number followed by the W means that it is a Winter weight, which means it has the viscosity of that weight oil if it were at operating temperature (210F), but doesn't mean that it acts like a SAE 5 weight oil would at operating temperature while cold.

Now with the modern multi-weight oils there are some properties that are built in the help reduce the extremes in viscosity, but not so much that it can ever be level in viscosity or operate backwards.

+1

cSt is the only number worth reading regarding viscosity imo.

Aidan · 01-10-2011, 02:30 PM

Quote:

Originally Posted by TypeOne

Oil gets thicker as it warms up. When your car sits and cools down, the oil thins out. The oil is thin so that it lubricates the engine better when everything is cold.

This is the worst explanation I've ever heard. Oil get thicker as it warms up?

And by the way. Hi everyone. Long time reader. First time poster. Please continue.

sonic370 · 01-10-2011, 07:36 PM

when sitting beside a lambo at a red light it is never a good idea to gun your
car

01-09-2011, 11:07 PM	#1 (permalink)
TypeOne A True Z Fanatic Join Date: Jul 2010 Location: Baton Rouge, LA Posts: 2,682 Drives: BSM 370 Rep Power: 1853	Confusion...ugh... Insert foot into mouth. :-X Last edited by TypeOne; 01-10-2011 at 08:29 PM.

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sonic370 A True Z Fanatic Join Date: May 2010 Location: Orange Texas Posts: 1,574 Drives: 09 370Z Sports PGK Rep Power: 20	when sitting beside a lambo at a red light it is never a good idea to gun your car