Originally Posted By: skyship
I would base opinions on tear down data, but none seems to be available showing comparisons with other oils.
The manufacturers sometimes publish test results for the final oil approved as a factory fill, BUT then they don't publish results for any other oils tested, so we don't even know if they selected the best or just a good economic one.
So in this instance, which do you think is the safer bet, the oil that you have the final test data for and has gained the approval, or an oil that somebody claims is "just as good" or "better", but it lacks the approval and they are asking you to rely on their word?
That's what I'm getting at here.
BTW, Doug's pictures (and his quote):
The above components have 1.2 million Km's on them and were returned to service after being measured.
Originally Posted By: Doug Hillary
Information:
Operation = Interstate, Linehaul,Reefer - one Driver for life,
Typical use per annum = 225kkms
Detroit Diesel 12.7ltr Series 60 @ 500hp, 1650lb/ft @1200-1525rpm
Cruise revs 1650rpm, Max revs 1800
Donaldson ELF Filters + MannHummel Centrifuge
Lubricant = Delvac 1 5W-40 (from 60kkms)
OCIs
Average = 99711kms
Longest = 116227kms
Data
Soot
Average @ OCI = 3.2%
Highest @ OCI = 7.8%
Iron
Average @ OCI = 134ppm
Highest @ OCI 221ppm
Highest TAN @ OCI = 6.13
Lowest TBN @ OCI = 2.26
Centrifuge uptake rate = 0.0029g/km
Oil consumption averaged almost exactly 6kkms/ltr
The two major condemnation points were soot (3.5%) @ iron (150ppm) - viscosity was always near new
I hope this is of interest
And a point about the bearings (somebody mentioned they looked like they had some wear on them)
Originally Posted By: Doug Hillary
They measured within specification and are still in the engine. As mentioend earlier where possible it is common place to "roll" them - this was done of course
Wear metals on this engine as requested:
Average at OC in ppm;
Copper 7 (30) Max recorded 63
Lead 43 (30) Max recorded 68
The bracketed figures are the condemnation limits from DD-MTU
Roll = changing the position of the bearing shell from top to bottom
And something somebody else noted:
Originally Posted By: yannis
So , if we divide by 10 we are getting 13.4-22.1 ppm of iron every 6.000 miles on average?
Which is why I personally don't take too much stalk in people obsessing over Fe PPM in a UOA. A quick look at that liner tells me that bore wear certainly wasn't an issue.