Anyone see the latest Motor Oil Geek video? In it he shows the bearing tester and debunks its validity for testing oil, I agree. But, he briefly shows oil changes to new spec but touches on the fact that lower calcium and phosphorous vreate smaller wear scars, is this accurate? Should I be looking for a lower calcium and phosphorous oil?
Lower Calcium and Phosphorous for less wear?
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no, it's about the ratio of phosporous to any other ingredient that competes for surface area. calcium being just one of them.
In the past, a 1:3 phosporous to detergent ratio was typical, now it's 1:2 or even higher.
But you will find the latest formulations largely dropped polar fluids from formulations aswell, these also compete.
In the past, a 1:3 phosporous to detergent ratio was typical, now it's 1:2 or even higher.
But you will find the latest formulations largely dropped polar fluids from formulations aswell, these also compete.
Note to all the users of HPL EC30/EC40 for "maintaining" a clean engine.
Esters only compete above a certain point. Under about 20%, there's no effect on wear, which is why the instructions for EC say 1:5 ratio (16.7%). ZDDP itself is a polar ester.
Plus the fact that motor oil formulations are different from gear oil formations and have different objectives due to the different operating environment. I for one am unconcerned about some improperly obtained “result” that isn’t primarily essential to a motor oil.
And it's a newly honed piece of liner, with a new piece of piston ring... how does the wear rate in that test develop over time? or in the timken or any wear test for that matter.
Good to know. At some point, doesn't the strength of the polarity matter too, not just the fact that it's polar? My chemistry is rusty-- electronegativity or such?
There's a 30 minute initial break-in cycle before testing begins. The test is run for several hours with phases of varying load and temperature.
yes, but at what point is that wear level reached? after the first hour?
yes it matters, the polarity comes from (usually) oxygen in the molecule, while the hydrocarbon tail wants to mix with the other oils. so short chain molecules are more polar, and that means there will be more oxygen atoms in a certain volume.
Temperature matters as well. the hotter the ester gets, the more energy it has and the stronger the desire to mix with oil. so eventually the polarity loses out.
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