quote:Following ASTM D445 test procedures, Exxon Mobil lists the kinematic viscosity at 100 C as 14.8 cSt. I don't know offhand of any oil company that tests oil viscosity at 120 C or 140 C. The ASTM D4683, the HTHS test, is run at an elevated 150 C and under very high shearing (One million shears per second). For example, Mobil Delvac 1300 Super 15W-40 is rated for HTHS as 4.3 mPa s @ 150 C. The designation mPa s is comparable to cSt, so you could also state the HTHS as 4.3 cSt @ 150 C. By comparison, Mobil 1 15W-50 is HTHS rated as 5.11 mPa s @ 150 C. Hopefully not too many folks need to run an oil that robust. Delvac 1 5W-40 appears to be a VERY stable and shear-resistant oil, so assuming M1 Truck & SUV is indeed the same, it should perform well. Jerry
Originally posted by moribundman: I'd be interested in the viscosity at 100, 120, 140, and 160 degree C.
quote:Thanks! Unfortunately, I'm in North West Ontario, and since NOCO is in Toronto, that really doesn't help too much. I just take the time to drive down to Minnesota and pick up the 0W-30 at NAPA or K*Mart. For as often as I have to do that, it's a nice little trip for me. Jerry
Originally posted by Quick_lude: Heaven forbid that the consumer had too much info.. Jerry, try calling these guys at www.noco.com/canada and see if they can get you the 0w30 or 5w40.
quote:[ February 11, 2004, 08:16 PM: Message edited by: buster ]
Mobil Delvac 1 Typical Characteristics Product Number 44111-3 SAE Grade 5W-40 Gravity, API 32.3 Pour Point, °C (°F) -54 (-65) Flash Point, ASTM D 92, °C (°F) 230 (446) Viscosity cSt at 40° C cSt at 100° C SUS at 100° F SUS at 210° F 95.0 15.0 481 79 Cranking Viscosity, cP at -25° C 3,200 Pumping Viscosity, cP at -35° C 20,500 Borderline Pumping Temperature, °C -44 HT/HS, cP at 150° C 4.1 Viscosity Index 167 Sulfated Ash, wt % 1.3 TBN, ASTM D 2896 11 Color, ASTM D 1500 5
quote:Dynamic viscosity is N.s/m^2 = 1 Poise, so 1 mPa.s = (0.001) Pa.s = = 1 cP or 1 centipoise, as the HTHS is always listed at the cP viscosity at 150 C. Kinematic Viscosity is 1 mm^2/s is = 1 centistokes or cSt.
For example, Mobil Delvac 1300 Super 15W-40 is rated for HTHS as 4.3 mPa s @ 150 C. The designation mPa s is comparable to cSt, so you could also state the HTHS as 4.3 cSt @ 150 C. comparable to cSt, so you could also state the HTHS as 4.3 cSt @ 150 C.
quote:HT/HS is a measure of the oils ability to resist 'shearing' or viscosity reduction. The standard HT/HS test is at 1 million 'shears' per second at 250C. Essentially, this number gives you the worst possible viscosity the oil will give. A higher number allows the oil to provide lubrication in high shear locations, like the bearing surfaces, lifter lobes, pushrod tips, etc. ferb!
Originally posted by Buzzsaw: What is HTHS? Thanks.