Do thinner oils (SAE xW-20, xW-30) do better at high RPMs?

[aquariuscsm]

Dr. Ali E Has would disagree with you on that one.

Dr. Haas is smart,VERY smart,has a HOT wife, but is wrong on motor oil

 

[Justus1]

But you said "Flow=lubrication" in post #10. Oil pressure does correlate to oil flow through a flow restrictive oiling system.

my thinking is this, if I have two of those old thump press type squirt cans and have 0w20 in one and 15w40 in the other, the 0w20 is going to flow with less thumb pressure

But you said "Flow=lubrication" in post #10. Oil pressure does correlate to oil flow through a flow restrictive oiling system.

 

[JT20]

my thinking is this, if I have two of those old thump press type squirt cans and have 0w20 in one and 15w40 in the other, the 0w20 is going to flow with less thumb pressure

There are no squirt cans in your engine.

 

[Justus1]

Dr. Haas is smart,VERY smart,has a HOT wife, but is wrong on motor oil

Haha. Well,, With a Hot wife, who cares about motor oil

 

[Justus1]

There are no squirt cans in your engine.

There are no squirt cans in your engine.

how do you know

 

[aquariuscsm]

Haha. Well,, With a Hot wife, who cares about motor oil

Haha right on!

 

[ZeeOSix]

my thinking is this, if I have two of those old thump press type squirt cans and have 0w20 in one and 15w40 in the other, the 0w20 is going to flow with less thumb pressure

If it was a positive displacement oil can, then the same volume of oil would come out, but it would take more thumb pressure to make that same volume come out with the thicker oil.

 

[JT20]

how do you know

Dude

 

[Justus1]

An engine will burn a bit more fuel to pump a heavier lubricant, which in turn results in the engine heating up a bit faster (a good thing, all things considered), but that fuel consumed is the reason that OEM's are chasing thinner and thinner oils, as the gains are primarily in short trip scenarios where engines are the least efficient in terms of operation. In steady state modes like highway cruising where the oil gets up to temp, the difference borders on immeasurable and in most cases likely is immeasurable outside a lab.

Of course all oils thicken as the temperature drops, so there is an advantage in terms of lower pumping losses if the lubricant starts out thinner. That said, an engine pumping 0w-20 at -20C is working a lot harder to move that oil than one pumping 5w-40 at 0C, so there is some relativity there. A popular adage on here has been "as thin as possible, as thick as necessary" which I think does a good job conveying the sentiment. If you are going to be spinning your rig to the moon or towing a trailer, this may warrant a more viscous lubricant than if you are doing runs to the corner store in Anchorage in February. Similarly, if you don't break 65 and drive like there's an egg under the pedal, you can probably safely use the thinnest grade allowed in the manual without a second thought.

Good points.

 

[Justus1]

Dude

I love talking with guys who can give and take a good joke

 

[Justus1]

If it was a positive displacement oil can, then the same volume of oil would come out, but it would take more thumb pressure to make that same volume come out with the thicker oil.

So, it is the flow and not the pressure lubricating the item squirted.

 

[Justus1]

Shall I miss the ring?

(Kiss)

 

[CR94]

As others have said,, engine speed will obviously remain the same in a given gear selection at the same road speed. However, if the replacement, being smaller, has less torque, it will must be in a lower gear and therefore indeed spin faster to maintain the same acceleration or hill climbing capability.

 

[kschachn]

So, it is the flow and not the pressure lubricating the item squirted.

It’s the oil film.

 

[kschachn]

(Kiss)

Are we just trolling now, quoting your own posts because you didn’t get a response?

 

[JT20]

disregard

 

[Justus1]

Are we just trolling now, quoting your own posts because you didn’t get a response?

No, I just misspelled kiss. Your response or lack of response don't bother me at all.

 

[aquariuscsm]

Anyone remember back when people said KISS (the group) stood for Knights in Satan's Service? I know, totally off topic!

 

[Justus1]

Anyone remember back when people said KISS (the group) stood for Knights in Satan's Service? I know, totally off topic!

Yes. I had forgotten about that. I had a good friend who wouldn't listen to their music because of that.

 

[aquariuscsm]

Yes. I had forgotten about that. I had a good friend who wouldn't listen to their music because of that.

Back when I was in high school, someone brought this paperback book to school for me to scope out called "Backward Masking Unmaksed". It's full of all kinds of neat stuff like that!! If I remember correctly, he moved away or changed schools or something and I never heard from him again. I still have it around here somewhere.

Amazon.com