I'd like to see some more Duramax used oil analysis reports. Both modified and stock engine reports would be great. Thanks!

LB7 with a 475+ tune

Delo 400 with 156 hours.

CR 1
SI 3
MO 121
FE 16
PB 7
CU 1
SN 20
NA 0
AL 0
SOOT 0
VIS 15

That looks good to me other than the tin reading. That seems sky high. What gives?

Base line on that batch of CI-4+ Delo came back with 22 ppm.
I have some more oil that should be later production. I will have another baseline ran.


The worst UOA that I ever had was with Delvac1. Fe doubled and copper goes 3X normal. Same power and hours ran. Seen the oil get the same results out of a C-15 also.

Thanks for sharing. It's helping me a lot as an oil geek to see how others are doing with various products and drain intervals.

FWIW: Lead/tin tend to go together to indicate bearing wear in most engine designs. Lead is the better indicator, as tin numbers do strange things to defy trending.

Shell Rotella 15w40--5000 mile change interval--56000 Miles--Stock Air Filter
No Make-up oil--Napa(Wix) Oil Filter--Stock Truck--Blackstone Labs Report
Alum. 1
Chrom. 1
Fe 6
Copper 3
Lead 2
Tin 0
Moly 0
Nickel 0
Mang 0
Silver 0
Titanium 0
K 0
Boron 0
Silicon 8
Na 2
Calcium 3585
Mag 12
P 1165
Zinc 1331
Barium 0

Insolubles 0.3

Here's a couple of mine that I posted a while back: UOA (http://dieselplace.com/forum/showthread.php?t=31514).

Ouch, you guys are getting way better UOAs than I got.

Maybe the Delvac 1 just isn't performing as well in this particular engine? I'm getting help from Terry Dyson of Dyson Analysis, so I think we'll get it straightened out.