First oil analysis help to understand

I don't know. Try this http://www.reliableplant.com/download/rp2011/jim_how_to_read_oil_analysis_le.pdf

Looks like it is best used for trend analysis and not spot checking.

 

Your Fuel Di is really high. That can be caused by LOTS of idle or Bad injectors. Fuel is bad in oil..

 

Just check on it next oil change.The viscosity of your oil is good if the fuel was high you would see the viscosity of the oil bad and wear metals will be up.try less idling see if it goes down next change.

 

Fuel dilution is indeed an issue. It is significantly higher than the Detroit warning limit on this engine. It is causing the oil to go from a viscosity of around 15 cSt (assuming a 40w oil) down to a 12.6 cSt viscosity which is into 30w range. You are at the edge of the warning limit by Detroit for viscosity loss. Iron is a non issue, at 12. You have to hit 200 to bump the warning limit on a 60. The rest of the oil sample is well within average for a engine in good condition. Surprising, given the fuel dilution going on. You just need to get a handle on the fuel dilution or you are going to cause future issues.

To be fair in this.... you need to do regular oil sampling to watch for patterns. Fuel dilution on this one sample may be a fluke. It all depends on what past samples have shown and what a future sample shows. You can NEVER base any decision on one, lone oil sample. Something as simple as what they used to clean the test machine between samples can skew the results. I have seen that happen. I would recommend the next go around you give a sample to two different labs and see how they compare with each other, and with this sample. Used oil samples are cheap to do compared to jumping the gun and tearing into a engine that may not really have a problem because you are spooked by one oil sample.

And since the wear numbers are very, very good on that engine in this sample, I am not convinced the fuel dilution seems to be actually occurring, but is more of a result of improper test machine cleaning between samples. With that kind of fuel dilution, wear numbers should actually be higher than they are. That is part of analyzing a sample. You get an elevated level of something, there is usually a corresponding change somewhere else. Like a spike in lead. Bearings are made of lead, tin, copper. If bearings are failing, all three levels would go up, not just one. All kinds of factors can throw monkey wrench into what a UOA shows. You have to do regular sampling and track trends and patterns to make a informed decision. After all, you don't just assume you brain cancer because you got a headache one day.

Here is the various limits from the Detroit Lube and Filters manual. You should always have such information to compare how your engine is doing.....

 

You're welcome. Used oil analysis is as much as art form as it is a science. One just can track sample results over time, see how things progress, and when a noticeable change occurs, try and figure out what else has changed. Maybe something simple like you went to a different brand oil or some other change that caused a noticeable difference in the trending patterns, but might settle down with the next oil sample. Regular used oil sampling is one of the best investments you can make toward your truck, and given they are less than most people spend to go out and eat with the wife or family, it is very hard to argue that they are a waste of money.