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This oil’s overall performance is almost certainly unknown to us, so judgements about that are not informed. Everyone is entitled to an opinion about it. The downside of posted uninformed opinions comes when less knowledgeable people read them and consider them to be facts. Lake Speed and HPL...

There are a lot of published studies that found that dispersants can compromise antiwear films. Use a search phrase such as: effect of dispersants on antiwear How much does that bridge cost, by the way? :-) Below are some studies...

Metal-to-metal contact is unavoidable. That’s what makes engine tribology interesting, challenging, and frustrating.

I didn’t state it in the following thread, but at 2 hours, my Noack estimate for it and M1 5W-30 is around 8.7%. That was before the SDS stated GTL base oils, so it may be less now. Link

What condemnation limit or failure mode do you all think generally happens first when the oil is run long enough? Some possibilities are high TAN causing corrosion, viscosity too high, spike in deposits, excessive dirt or coolant content (let’s exclude this one since it is not the oil’s fault)...

No. It is the viscosity at 150 C temperature and 10^6/sec shear rate or similar shear rate, depending on the test method. It is not measured in high pressure conditions, as I saw someone say. A very viscous oil at low shear rates like Lucas Oil Stabilizer would have a lot of temporary...

Solvancer is a solubility enhancer. Sounds a lot like whatever VRP uses. https://www.mobil.com/en-us/industrial/pds/us-xx-mobil-solvancer https://www.fluitec.com/the-hansen-solubility-principles-and-its-relation-to-varnish/

Did they give examples of solubility enhancers? Hopefully yes and I just missed it.

Zero or near zero for PAO and AN, due to lack of oxygen atoms. I expect non-GTL Group III to have a very small concentration of oxygen containing molecules because the processing tends to get rid of the oxygen-containing molecules present in crude oil. I expect GTL to be similar to PAO in...

That Pennzoil has very little calcium and magnesium compared to the competition. I do not think they chose that in order to make a better oil. I would avoid that oil even if there is enough TBN, simply due to me not liking to reward a half-hearted effort put into the product. You have a lot...

I’m glad my memory didn’t fail me. lol

What is the evidence for ESP 5W-30 having AN? I might be misremembering what oil’s FTIR graph was posted, but I think it was this oil and I saw no sign of AN, which look like fingers in a certain part of the graph.

How do you define undue tendency? How did you come to the conclusions that there may have been an issue before but now it’s definitely not an issue? What do you conclude from the shear stability tests that Lakespeed Jr and HPL did on the various Mobil 1 0W-40 oils?

It’s good that you couldn’t order that Castrol 5W-40 oil. Castrol has cheapened out on that oil for well over two decades. Get this QS Euro 5W-40 while it is still available and for such a great price of $69 for 3 gallons...

Virgin PAO’s oxidation should be zero or near zero, so the high value is mostly from the ester, and a minor amount from the additive package.

I suspect that Castrol Euro Edge 0W-30 is less volatile than Castrol Edge 5W-30, but it is somewhat an unfair comparison because the 0W-30 is considerably more viscous at 100 C and they are not exactly in the same Castrol lineup. It’s a shame that so few manufacturers list Noack values. They...

A Lubrizol study mentioned on BITOG said SAPS content does significantly contribute to IVD. I have not read the study, but would like to if it is free. If someone has a link to it, please share it.

Some brands’ lineups vary the basestock types used across the viscosity grades and some do not or if they do, it is not a big difference. In the latter cases, their 0W-X tends to be more volatile than their 5W-X oil. Likewise for their 5W-X compared to 10W-X. The truth is what people dislike...

I’ve said this many times since I joined long ago, but it is worth repeating. I bought a new Subaru Impreza RS around year 2000 and used Valvoline Synpower 10W-30 and some other synthetic oils. It consumed around 3/8 qts per 1000 miles with those oils since new. When I used Red Line 10W-30...

Interesting oil. Contains alkylated naphthalene like M1 EP and Truck and SUV do. Very shear stable, as expected given the relatively low VI in the low 140s. It might not contain any VIIs with such a VI. Indeed contains much more ZDDP than most typical API SP oils. His lab results for Zn and...