What Determines Oil Pressure?
04-20-2009, 10:09 AM
#22
"Oil Viscosity
The viscosity of multi-weight motor oil is specified using two numbers. The first number is the viscosity when the oil is cold. This is followed by the letter W (which stands for winter, not weight), which is followed by the number that indicates the viscosity when the oil is at operating temperature. The higher the number the thicker the oil."
http://www.nordicgroup.us/oil.htm
Here's another link for you:
http://www.aa1car.com/library/oil_viscosity.htm
The viscosity of multi-weight motor oil is specified using two numbers. The first number is the viscosity when the oil is cold. This is followed by the letter W (which stands for winter, not weight), which is followed by the number that indicates the viscosity when the oil is at operating temperature. The higher the number the thicker the oil."
http://www.nordicgroup.us/oil.htm
Here's another link for you:
http://www.aa1car.com/library/oil_viscosity.htm
04-20-2009, 11:41 AM
#23
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start your car and see how high your oil pressure is at idle (thicker oil) then let it idle for an hour without moving the car(gets the oil hot and thin) and you'll lose 20 psi. oil does NOT get thicker when hot.
go put a quart of oil in the freezer and then put a quart of oil in the sun for a couple hours... see which one drains out of the bottle faster.
the 5w or 10w are merely winter ratings that show how the oil flows at freezing point. It could just be some arbitrary number the SAE came up with to rate the cold flowing characteristics. those numbers are not on the same scale as the second set of numbers. you are misinterpreting the articles you posted. take 10w-30. 30, the second number is the weight of the oil. 10w is how well that particular oil will flow when at freezing point. It DOES NOT mean it is thinner when cold. hot oil will always be thinner then colder oil.
04-20-2009, 05:12 PM
#25
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http://www.upmpg.com/tech_articles/motoroil_viscosity/
"The VI additives have the effect of keeping the oil from thinning excessively when heated."
Please research before making retarded posts.
"The VI additives have the effect of keeping the oil from thinning excessively when heated."
Please research before making retarded posts.
04-20-2009, 08:56 PM
#26
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http://www.upmpg.com/tech_articles/motoroil_viscosity/
"The VI additives have the effect of keeping the oil from thinning excessively when heated."
Please research before making retarded posts.
"The VI additives have the effect of keeping the oil from thinning excessively when heated."
Please research before making retarded posts.
04-20-2009, 10:22 PM
#27
http://www.upmpg.com/tech_articles/motoroil_viscosity/
"The VI additives have the effect of keeping the oil from thinning excessively when heated."
Please research before making retarded posts.
"The VI additives have the effect of keeping the oil from thinning excessively when heated."
Please research before making retarded posts.
Not sure how recent that info is but M1 is not currently a PAO base IV oil and GC is as it was designed as OEM oil for Mercedes /BMW specs.. There was actually a lawsuit against Mobil when they changed their formula and continued to call it synthetic but they won and others also switched to group III base to save $$$ also..
I will just keep running GC for sure.....
04-21-2009, 12:56 AM
#28
Do any of you use Valvoline? If so, how's your oil pressure?
A while ago, someone had told me that Valvoline had made the bold claim that their oil surpasses the other popular brands such as Mobile 1 and Castrol in strictly performance; that Valvoline offers better parts protection, which assumed included heat resistance against thinning.
A while ago, someone had told me that Valvoline had made the bold claim that their oil surpasses the other popular brands such as Mobile 1 and Castrol in strictly performance; that Valvoline offers better parts protection, which assumed included heat resistance against thinning.
04-22-2009, 10:19 AM
#29
The oil pressure is measured by the sending unit, located at the top rear of the block on a factory LS1.
The sending unit is measuring oil pressure present at that location, basically a summary of how much total resistance your engine components {main bearings, rod bearings, cam bearings, lifters} are imparting on the flow of oil before it's dumped back into the pan.
04-22-2009, 10:29 AM
#30
Evidence that a little knowledge can be a dangerous thing. I'll take one pop at explaining this, maybe it will help.
First, all liquid lubricants known to mankind thin when heated, and thicken when cooled. Just accept this as fact for now, it'll make sense shortly.
Visualize a straight-weight 30W oil. It's thick when cold, thin when hot. Fact.
Now visualize a straight 10W oil. It's thick when cold...but not as thick as the 30W oil. It's also thin when hot, thinner than the 30W oil.
A multi-vis 10W-30 oil will be as thick as the 10W oil when cold, and as thin as the 30W oil when hot.
Hope this helps a bit.
First, all liquid lubricants known to mankind thin when heated, and thicken when cooled. Just accept this as fact for now, it'll make sense shortly.
Visualize a straight-weight 30W oil. It's thick when cold, thin when hot. Fact.
Now visualize a straight 10W oil. It's thick when cold...but not as thick as the 30W oil. It's also thin when hot, thinner than the 30W oil.
A multi-vis 10W-30 oil will be as thick as the 10W oil when cold, and as thin as the 30W oil when hot.
Hope this helps a bit.
05-02-2009, 01:57 AM
#31
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Hint: it's not the thrill of potentially getting burned.
05-02-2009, 02:08 AM
#32
i know i had a fair share of AWESOME oil burns lol 