Undertaker

Why is it 2 days after changing my oil in my 2007 Cummins 5.9 the oil looks dirty already?

Danavilla

Typical with 3rd gen engines. Has to do with injection events for smog control.

Texan1983

typical with any diesel engine.

psd1

I'll bet it didnt take two days to get that color...

Lost Lake

2 days??? Mine is dirty after the warm up to check the oil level once I've changed it.

It's a diesel. Diesels have lots of soot. Pretty normal.

rockcrawler304

Same here.
The 2004's and down are not as dirty but 04.5 and up get dirty right away. It is normal though.

Pikeman

Dirty isnt bad. Isnt 15w40 black in the jugs??

05 Ram 3500 SRW

they should pin this thread at the top. someone asks this question about every 10 days on here. nothing wrong with that though. it would just save starting new threads.
so the dirtier oil doesnt wear these engines out sooner?
dads older Ford stays really clean. we've always changed it at 5000kms though. thats not very many miles

CoastalDav

Not true. My previous truck a 2000 3500 Cummins would run for 4000 miles before the oil started to turn dark. Up until then, you could see right thru it on the dip stick.

My 06 as stated, turns black right after the oil change at start up. Dodge and Cummins talk about dusting the engine, they should consider what's going on in the pan and the accumalation of soot and carbon.

If the 3rd injection event (EGR) is causing the problem, and the rings are not holding it, allowing soot and carbon to enter the pan, they have a problem with the rings and wear, as far as I'm concerned. This may cause compression problems down the road.

Dave

Lost Lake

Well they are breaking a lot of rings in the '06's.... Hope my Smarty puts an end to that...

slimpicken

Mine stays clean for a pretty good while. Weeks with over a hundred miles a day 6 days a week.

Spooler

As stated above, The 03' and 04' trucks are no where near as bad as the 04.5 and up trucks.