Engine Oils and ZDDP

[Gordon C]

Engine oils and ZDDP

Might be of interest to you ?

http://www.chevelles.com/forums/13-performance/443674-zinc-myth-test-data-dozen-more-oils.html

[Jonathan Kay]

That's a rather unusual way to present technical findings. Is the test that he is using well known or validated?

Jonathan 

[Golf Juliet Tango]

Any comment with a huge preponderance of CAPITALS as that one does, fails to inspire confidence in me.

I'll take advice from the man who has re-built my engines.

[Gordon C]

I'll take advice from the man who has re-built my engines.

I said exactly the same when i was pointed to this earlier today. GJT, I'm sure we use the one and the same fella for our engines. Good enough for me 

 

[Dr Slotter]

I've not seen this type of work presented like this before. The article doesn't appear to say explicitly what contact geometry or contact relative motion the test rig he is using is, which makes it a bit difficult to comment on it, but I would guess from the results that it is something called 'unidirectional sliding' for him to maintain a lubricant film for the specimen to 'penetrate' as he describes it.

You would normally present wear data of some kind (volume, mass loss or similar) usually against something like total distance in sliding, total number of impacts etc. depending on the contact you were looking at, for each lubricant. The way he has presented the data is a bit 'backwards', but sort of makes sense.