Ashless alternatives to ZDDP

[ylk1]

I've seen a lot of discussion on ZDDP in this forum but very little on it's ashless counterparts.
Lot of alternate options in literature. But can't commercial products info.

Anyone knows what's the dominant ashless anti-wear agents out there?


Tribochemistry and Morphology of P-Based Antiwear Films:
https://link.springer.com/chapter/10.1007/978-3-319-99897-8_6

• Neutral or acidic ashless dialkyldithiophosphate (DDP)

Tribochemistry evolution of DDP tribofilms over time using in-situ synchrotron XAS:
https://www.sciencedirect.com/science/article/pii/S0301679X21001742#bib12

• Neutral DDP/Acidic DDP

Mechanical Properties of Tribofilms Formed by Metal Dithiodiphosphates:
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4762448

• Octlyamine/Mg/Ti/Zn - DDP comparison

Study on the synergistic lubrication mechanism between sulfur-phosphorus-free deep eutectic solvents and ZDDP:
https://www.sciencedirect.com/science/article/pii/S0301679X2500667X

• sulfur- and phosphorus-free oil-soluble DES

Superlubricity of multilayer titanium doped DLC coatings by using low SAPS organic additives in base oil:
https://www.sciencedirect.com/science/article/pii/S0301679X24009381

• Duraphos®178 and Duraphos® OAP

 

[JavierH19]

Good old moly does the trick and with potassium borate, organic titanium, and boron you can make an oil without any zddp and phos. It's all chevron delo adf 600 has minus the titanium since they seemingly didn't need it. It's 0.4% saps so it's considered "ultra low ash" There's not enough incentive to create new ashless antiwear additives with haste but i'm sure they won't stop developing but for the most part the realm of ashless antiwear additives appears to be satisfied well enough with the aforementioned existing options. The saps limit would need to keep going down a bunch more to where even 0.4% is too much but that'll be in a very long time.

 

[ylk1]

Thanks for pointing out Delo 600 ADF!
Never seen such low ash oil with completely different chemistry. Wish there was some info on the anti-wear agents used.

 

[CleanSump]

Thanks for pointing out Delo 600 ADF!
Never seen such low ash oil with completely different chemistry. Wish there was some info on the anti-wear agents used.

Try googling for big truck and off road equipment forums and there will be more info. There was a lot of doubt and flat out hate when it came out, but the oil was formulated using testing by large trucking companies and apparently wear and turbo protection is not a problem.

Edited because I have sticky keys and spellcheck isn't that smart.

 

[greaseguy15]

Here’s a good STLE article on ZDDP and why it’s so prevalent as well as alternatives.

https://www.stle.org/files/TLTArchives/2022/01_January/Cover_Story.aspx

Most of the time when I see ashless formulations it’s using a phosphorous antiwear/EP chemistry and no zinc or sulfur containing compounds. There are definitely viable alternatives to zddp as pretty much every lubricant company has an ashless hydraulic oil. The replacements are just more expensive so they’re only used when necessary

 

[johnmyster]

On first OCI with ADF600 in my old truck and it hasn't died yet.