Originally Posted By: m37charlie
Originally Posted By: motor_oil_madman
Not much of an additive package compared to what we have now for oil.
What?
It has >3000ppm Ca!!
Just because it doesn't have B, Ti or Mo doesn't make it a bad oil. It is very likely to be a CI4+ oil. The additive difference between that and CK4 are: less organometallic detergents and Zn/P now, but perhaps "better" non-organometallic additives that are undetectable on an oil analysis.
I will have 800 hrs/28K/3 yrs mi on my Unimog oil when I get it back home this July. Seriously thinking about stretching it to the Benz recommended interval of 1200 hrs (42K mi in my application) though I'll do a UOA for sure when I get back.
Charlie
I agree, Charlie. It's loaded with Ca, and the Zn/Phos is decent too.
The OCI had at or near the average miles for a Blackstone UOA for this engine series, and the only concern is Fe is a tad elevated.
We could theorize, it's possible that there was some minor formation of rust on some parts (cylinders? rings? cam lobes?) that, once scuffed free, got into the oil stream and registered as Fe (rust is just oxidized Fe, after all, and will show up as Fe in a UOA). Because he only started it a few times a year to move it around the yard, it did get some lube pumped up to the top end upon every move. Unless we saw a tear down with clear observations, we're really only guessing here. But I contend that the Fe wear is not objectionable by any means, and given the circumstances, reasonably admirable.
Also, we can presume one of two things happened with the add-pack:
1) it stayed in suspension well
2) it fell out, but re-joined after a good 30 mile run
I don't know which is true, but it really does not matter now, does it? The additives are clearly present
So after 10 years of sitting idle, the only real concern was a slight bump in Fe.
Really puts those "... or 1 year ..." concerns to shame, does it not?