Thought I'd share my oil analysis report on my truck.<br><br>Oil- Amsoil 15W-40 full synthetic<br>Filter- Amsoil SDF80<br>Air filter- Amsoil 2 stage oiled<br>Miles on oil- 6,275 (installed 4/1/03)<br>Miles on truck- 87,255<br>Sample date- 7/7/03<br>Lab- Blackstone<br><br>Elements in parts per million.<br>First # is test data, 2nd is universal average.<br><br>Aluminum 3/4<br>Chromium 1/3<br>Iron 13/44 <br>Copper 1/3<br>Lead 2/3<br>Tin 2/1<br><br>Molybdenum 1/40<br>Nickel 0/0<br>Manganese 0/1<br>Silver 0/0<br>Titanium 0/0<br>Potassium 1/1<br><br>Boron 0/40<br>Silicon 3/9<br>Sodium 3/3<br><br>Calcium 3796/2529<br>Magnesium 14/466<br>Phosphorus 1087/1088<br>Zinc 1234/1280<br>Barium 1/0<br><br>Properties;<br>test values/should be<br><br>SUS viscosity@210F 74.4/68-80<br>Flashpoint 475F/&gt;410F<br>Fuel &lt;0.5%/&lt;2.0%<br>Antifreeze 0/0<br>Water 0/&lt;0.05%<br>Insolubles 0.5%/&lt;0.8%<br><br>Blackstone comments;<br>&quot;No problems showed up in the intial sample from your Cummins. All wear read at or below averages for this type of engine, which is a very good indication of normal wearing parts and careful operation. The universal averages show normal wear after about 6400 miles on the oil. Insolubles(oil oxidation due to heat, use, and blow-by) were low at 0.5%, showing good oil filtration. No fuel dilution or antifreeze was found. The TBN read 7.7, so the oil could have gone longer. Try 8500 miles for the next sample. Nice Cummins!&quot;<br><br>Overall I'm impressed, but then again I should be, as this oil is nearly $20 a gallon, and that oil filter is $14. I thought for sure the silicon(airborne dirt) number would be higher, as I did drive considerable distance on dusty, gravelled roads in Canada back in May, but the air filter appears to be doing it's job. I changed the oil filter at sample time, added 1 1/2 quarts make-up oil, and am continuing to run it. Guys, the Cummins is a clean machine!

 

I have used Blackstone since day one on this truck, just got my latest oil report last week. My numbers are, as Gary said, basically identical to yours. I used Delo 400 for the first 30K miles, since I had a stock pile of it, have used Amsoil 15W-40 for the last 35K. I change filters at 5K, oil at 10K intervals, SDF80 full flow Amsoil filter only.<br><br> ;D<br><br>Tom

 

The Cummins is again, a clean running engine. You definitely don't need to be running an expensive synthetic to get low wear numbers. In fact, changing oil at less than 5,000 miles, using any diesel rated oil, is probably a waste with this engine. I don't think the PSD or Dmax can achieve such good wear numbers.<br><br>Just a note, I'm out of warranty on the engine, thus the reason I used the Amsoil oil filter. Otherwise, I think the Fleetguard Stratapore is a better value. From all the hype I've heard of Amsoil, I thought I'd give it a try. It's not bad stuff, but I don't know if the extra cost is really worth it in the long run??

 

Got my first Oil report on Moday. Running Rotella 15/40 with 33k and my numbers are almost the same. I live in a very dusty area in ruarl TX and change my air and oil filters often. I did expect my Silicone numbers to be higher due to the dusty roads I drive on. Overall I am very impressed with the cummins. ;D