SAE Study: Affect of Fresh Engine Oil on ZDDP

[m6pwr]

Some time ago I read (on BITOG I think) about an SAE study that showed that fresh engine oil had a tendency to take up or dissolve the antiwear layer laid down by the old oil before it formed its own antiwear layer. This SAE study would seem to support this phenomenon - http://papers.sae.org/2007-01-4133/.

Can anyone provide a link to the SAE study I'm looking for?

 

[dave1251]

Not directly related. But I have another paper for you.

http://papers.sae.org/2004-01-2986/.

The best explanation that I can give you with my limited knowledge and experience on this matter.

The film formation behavior of lubricating oils with ZDDP additives, the thickness of the films tend to increases with temperature and test time test have shown that ZDDP-containing oils form chemical films, ZDDP film formation occurs at elevated temperatures and begins in the range of 130°C to 170°C, temperature variances have been linked to base oil type. Some studies have shown the break down of ZDDP provides anti-wear protection not ZDDP itself.

This being said I am not a Tribologist nor due I have a lab to to duplicate these results. There are Tribologist and other better educated on the matter that will chime and explain this better to use and correct my mistakes.

 

[friendly_jacek]

Have you tried searching?

http://tinyurl.com/3nkodbp