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The high temperature is meant to apply to the pistons and cylinder walls. This thread has a cartoon showing such temperature ranges. https://bobistheoilguy.com/forums/threads/pennzoil-platinum-euro-l-5w-30-volatility-results-dec-2024.390817/

Jetronic, I saw you mention that Ravenol oil a few months ago. I wanted to buy and rest it. Looks like it is not available in the US. The closest thing is a semi-synthetic oil that has no Noack listed...

There are indicators about which oils will have low or high volatility, like base oil types used and their percentages, VII (somewhat directly related to volatility), viscosity at 100 C (somewhat inversely related to volatility). Esters of types used in motor oils tend to be very low in...

I will think about it and let you know if the answer is yes. Thanks.

No problem. Maybe you already understand what the second graph shows but in case not, I will give an analogy for what that data shows. Joe lifted 4 pounds of dirt from hours 0 to 1 and 3 pounds from hours 1 to 2. Jane lifted 5 pounds, then 4 pounds. The graph’s value at hour 2 for the ratio...

It shows the measured weight losses for four different oils in a test lasting four hours with losses measured after each hour. A generous member sent me samples of oil and this test mixed 5W-30 and 5W-40, while another set of oils he sent were done in another test. I care about volatility...

Importance of volatility is a very complicated matter and there is still a lot of argument about it, as this thread indicates. This thread has posts by some very knowledgeable members. https://bobistheoilguy.com/forums/threads/noack-vs-teost.330986/ I have measured volatility because it can...

Do you mean why does volatility matter or the do you mean something about the relative differences of these oils’ volatilities?

ndarkside93, that is impressive enough that I think it warrants a thread dedicated to it, since it is now buried on Page 76 of this monster thread. :)

The test was conducted on Dec 30, 2024. Temperature was set on the oven to what looked like ~ 420 F. A thermocouple reading on an oil with that same oven setting on Dec 27 said 431 F, when was ambient temperature was 47 F. Ambient temp. at start of this test was 60 F. Quaker State 5W-40 was...

ndarkside93, your engine went from heavily varnished as seen through the oil fill hole to how it looks in those photos? What oils did you use prior to VRP and roughly how many total miles were done with those oils? Thanks.

It does make me wonder too, Subie. One thing that is clear is that burning oil leaves a mess, so it is at least somewhat of a vicious cycle. I think oil consumption is kept in check partly by really thick deposits being more fragile mechanically and being more prone to heating up more and...

I will try to find another picture later showing the VRP cup after I cleaned it with soap, water, and paper towel. There was an unevenly-distributed black film deposit with enough thickness that it could be felt. I think it was additive-derived, not oil-derived. Due to the color, one guess is...

Hopefully someone here is willing to use their lawn mower for a test, involving taking the piston out and photographing it. Do it before using VRP, run VRP for a long enough time (~ 120 hours) roughly corresponding to a typical OCI in a car, then photographing the piston. That requires serious...

The order in the picture is the order they had in the oven. I agree that Amsoil experienced more heat by being next to VRP that burnt so completely. QS Ultimate Durability 10W-30 has extremely low volatility, so that likely had a role in how soon its fire went out and how much oil remained. I...

I suspect you are right that on a given fill of the oil, the cleaning rate tapers off. Therefore the cleaning could be sped up by more and shorter OCIs. This is for only the truly dedicated!

Here are some examples from past tests with entirely different test conditions. The first image shows the copper leaching that a virgin oil did within seconds of being at high temperature. Saw it happen in real time which was pretty wild. Took the photo after letting the oil cool. The...

After the 5 hours of the volatility test, the copper cylinders were added. Prior to that, I rubbed sandpaper on them so they had no corrosion. The cylinders were fully coated in oil but the oil level went up to about halfway. First, the oils were heated to ~200 F for 30 minutes. No...

I was scrolling through some of my photos and thought I’d share what motor oil ash looks like. See the cup on the right. These oils unintentionally autoignited in a test. It was VRP’s fault and it caught the other two oils on fire. VRP burnt very far to completion, allowing it to form a lot...

Gas-to-liquid (GTL) oils tend to have very low volatility because they have a narrow size distribution compared to regular Group III. Their volatility is similar to PAO of the same viscosity. GTL is made from natural gas, but it no longer has natural gas properties. Like if you eat chicken...