Short start/stop/sit trips, best protection?

[Shannow]

Statement was to choose the specced oil with the lowest viscosity.

when questioned, you speculatied about which would end up thinner in the end...nit factually based, evidence based, information bought to the thread, plain old speculation.

(Which I find funny, as you've accused another poster of researching facts after making statements...no evidence supplied by your good self sir)

When I mentioned HTHS, and the fact that HTHS loss is typically half of KV loss, you changed tack again...and now that's what you were taliing about all along.

They were the issues thank you.

 

[Ducked]

I agree there isn't likely to be much difference in protection between these oils, or indeed any oils.

So I said may as well choose the thickest, which still seems, in the declared context of wear, the best of the two options.

It is, however, true that I hadn't looked for experimental evidence on the wear/viscosity relationship before, and I think I acknowledged that failing in the above post. I'd expect there is better information out there, but that's all I could find in a short time.

This has been sort of interesting but I have to do some work now.

 

[CharlieBauer]

Originally Posted By: Shannow
Statement was to choose the specced oil with the lowest viscosity.

when questioned, you speculatied about which would end up thinner in the end...nit factually based, evidence based, information bought to the thread, plain old speculation.

(Which I find funny, as you've accused another poster of researching facts after making statements...no evidence supplied by your good self sir)

When I mentioned HTHS, and the fact that HTHS loss is typically half of KV loss, you changed tack again...and now that's what you were taliing about all along.

They were the issues thank you.


Well at least you're not now accusing me of claiming 5w30 will become thinner than 5w20!

So now you know the context was 5w20's with very similar HTHS, and you already know that different oils are constructed differently using different base oils and different types of VII's, you are nevertheless claiming that me saying to the OP that he could research oils to see which one will shear less is speculation!

Regardless of viscosity, wouldn't you advise him to get a shear stable oil too?

I have to say that I am surprised by the intensity you are showing on this and your proclivity to interpret whatever is said by me as equivalent to claims made by others at other times. I ask nicely that you give it a rest. It is not pleasant to be subject to it. However for my part I apologize if I jabbed at you earlier.

 

[Shannow]

It's all cool...

Yes, I would advise a shear stable oil. But that's not really going to be defined by being the thinnest in the grade

But the question was with regard to stop start, so I strongly suggest something with either Castrol's surface active chemistry or some other oil with similar chemistry (alas, we only know about Castrol's versions of it).

I mistakenly took your answer for thinnest in grade to be the misconception that thin equals more flow, flow equals lubrication which has been pervasive on the board for decades.

 

[CharlieBauer]

Btw, here is the datasheet of the oil he has chosen. Viscosity at 100c is 8.7.

https://www.fcsdchemicalsandlubricants.c...tic%20Blend.pdf

Here are the details on M1 Annual Protection. Their 5w20 has a viscosity of 8.2, HTHS 2.6.

https://mobiloil.com/en/motor-oils/mobil-1/mobil-1-annual-protection

Genuinely curious as to whether in the absence of any other information, the conclusion is that the Motorcraft is better because of the higher viscosity. Or is there other information in that data that can help determine which to choose?

 

[Shannow]

Those two data sheets, to my mind are too incomplete to really try to split differences.

Even complete data sheets would end up hair splitting.

e.g.
http://www.pennzoil.com/en_us/products/f...tinum-5W-20.pdf

looking at the CCS and MRV, you can infer that the influence of VIIs is relatively low.

versus (and yes, I know it's a 0W20, just an example)
http://lucasoil.com.au/pdf/TDS_SAE-0W-20-MO.pdf

Where the MRV is so much more than double the CCS, and has high VII influence, and likely lower shear stability.

edit...
http://www.pennzoil.com/en_ca/products/b...0-Motor-Oil.pdf

Can see this effect in a 5W20...a fair whack of VII to get 150 VI out of a dino.

 

[littleant]

Agree with JHR2. I would go with PUP/QSUD or any top tier 5W-30. Fram ultra. UOA at 3,000-5,000 miles just to see what if any issues you may have or not have.

 

[Virtus_Probi]

Originally Posted By: Shannow
Those two data sheets, to my mind are too incomplete to really try to split differences.

Even complete data sheets would end up hair splitting.

e.g.
http://www.pennzoil.com/en_us/products/f...tinum-5W-20.pdf

looking at the CCS and MRV, you can infer that the influence of VIIs is relatively low.

versus (and yes, I know it's a 0W20, just an example)
http://lucasoil.com.au/pdf/TDS_SAE-0W-20-MO.pdf

Where the MRV is so much more than double the CCS, and has high VII influence, and likely lower shear stability.

edit...
http://www.pennzoil.com/en_ca/products/b...0-Motor-Oil.pdf

Can see this effect in a 5W20...a fair whack of VII to get 150 VI out of a dino.


Very interesting observations...they would imply that Pennzoil Gold 5W30 also has low VII influence.

This oil really fascinates me, it's marketed as a blend but has some properties that impress me more than those of the synthetic PP 5W30. Wish I knew what the NOACK loss was, but it should be under 13% as a dexos1 oil. I broke my own rule about running "full synthetics" in my FXT to try the stuff, I am confident there is a less than 30% chance my engine will explode in flames before 80,000 miles as a result. ;^) Actually ended up costing me more than PP at the time as I would have gotten a $10 rebate on my purchase price of ~$23 for that while the PG was $18 with no rebate offered.