Measured on new oil by a special test machine. Some manufactures list a HTHS viscosity in the specs and some don't. If they don't you can typically call them for the info.
Can't measure dynamic viscosity in a dynamic viscosity test machine without shearing it to some degree. Guess you could calculate the dynamic viscosity due to the super low level of slight motion and shear in a kinematic test rig. cSt x SG = cP. But need to use the cSt and SG at 150C to get an accurate cP calculation.
I hear variations on this theme here often. Just xyz and you'll never have issues. And that probably works for a lot of people. But issues like this one where the Q7s turn into oil burning monsters even running Castrol Euro at good intervals. Lots of examples of Subarus like Glenda's burning oil even with religious high quality oil changes at 5k intervals. (I know in this example, an oil with HTHS <3.5 was used, but it's just a broader point about oils meeting the spec and beyond and still falling short.) Anyway, I'm slowly beginning to wonder if Amsoil or HPL are really the only options if you want to never worry about having an oil related issue.
What’s your definition of a “Euro” oil? Many if not most oils that carry a European approval also have an API license.
Oils that state "ACEA A3" are 3.5 or above.
C3>A3 for compatibility
HTHS loosely correlates with viscosity. For example a 20 grade can't have a HTHS below 2.6cP and a 40 grade can't have a HTHS below 3.5cP.
What is "oil pump strategy"?
This isnt at all what he asked. Just answer the guys questions instead of acting like you hold all the knowledge and dont believe the answer will help him
Thank you for pointing this out to me, normally I am an Ohio State Fan when they play Michigan, this year I will be cheering for Michigan to Win.
Continuously variable displacement oil pump. For example it has been reported that BMW will modify the flow of oil through the bearings with the B-series engines and their new ultra low viscosity oils (0w8/12/16).
I appreciated his answer. His questions are fine and relevant. I appreciate everyone who has posted.
I meant Wallyworld online sold by Walmart (not 3rd party resellers). If it costs over $30 for 5 quarts, then I'm out. I generally look for $26, $25, or lower. I occasionally buy at NAPA or Oreilly online when on sale. I like bargains that perform well. Bargain hunting is half the fun.
Hard to beat Quaker State Euro 5W-40 sold at Walmart. $23 not on sale. Or M1 ESP 0W-30 for usually $27.I meant Wallyworld online sold by Walmart (not 3rd party resellers). If it costs over $30 for 5 quarts, then I'm out. I generally look for $26, $25, or lower. I occasionally buy at NAPA or Oreilly online when on sale. I like bargains that perform well. Bargain hunting is half the fun.
As you can see above, I quoted myself. That means I'm either cool or a jerk! You decide which.
In 5W-30, no. I think API mandates it is below 3.5.
Variable oil pumps decrease power requirements and subsequently reduce fuel consumption. They don't enhance the engine's ability to tolerate low HT/HS oils. Film thickness keeps parts separated, and all those other things you mentioned such as oil coolers are meant to do just that - keep the oil from becoming too thin. They essentially "prop up" the deficiency.
The SAE gives minimum HT/HS requirements for gasoline engine oils.
