Well this is a first for me.

[echoman]

i used to haul conventional oil in tankers. 6500 gals at a time. conventional oil is bought from which ever refinery is selling it the cheapest at the time and then bottled and labled buy a third party. not sure about snythetic oil.

 

[3Ts]

Ya I'm good - Also I live in extreme conditions for equipment. 120 degrees PLUS ambient temps, so you can imagine how much heat the engine is generating

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120* I thought those temps were only in Death Valley. I looked up where Coachella is - just north of the Salton Sea, so I guess you might as well be in Death Valley.

 

[ovrszd]

New diesel engines run soooooo much cleaner than older models. Once you get into the Tier IV equipment they just don't dirty the oil like before.

I change oil in our Grader at 250hrs. It's not black when I drain it.

I change oil in my 1984 Ford tractor at 100hrs. It's black as coal. Actually it blackens within 5hrs of use.

Improvements in materials have allowed much smaller clearances which have minimized oil contamination in modern engines.

As to oil weights, my wife's 5.7L Hemi runs 5W-20. Talk about water.....

Was highly scolded by my mechanic Son when I told him I switched it to 15W-40!!!!! Next change I went back to 5W-20 as recommended.

 

[TractorGuy]

None of my current diesels dirty the oil like we used to see.

Must be the fuel we get today.

 

[LouNY]

None of my current diesels dirty the oil like we used to see.

Must be the fuel we get today.

Wait till you get one with EGR your oil will never look clean.
The cleanest diesel oil was the early common rail systems.

 

[Oldpath05]

My oil turns black not long after its change but least I dont get a steady stream of black exhaust, just a little dark if I step on it. I think gas engines keep oil cleaner and looking newer longer.

 

[Big Barn]

New diesel engines run soooooo much cleaner than older models. Once you get into the Tier IV equipment they just don't dirty the oil like before.
.

I am of the opinion this is the answer.

 

[ptsg]

New diesel engines run soooooo much cleaner than older models. Once you get into the Tier IV equipment they just don't dirty the oil like before.

I can relate to that.

Got the engine oil changed on my tractor at 50 hours, it come out almost as clear as the one that comes straight of the bottle.

Now, with 180 hours on the new oil, it's just getting a darker color. No emissions stuff on it either.

 

[TractorGuy]

ON PURPOSE. 4 things a man should never talk about. The oil he uses, politics, religion, or pickup truck to buy. Any of these has the potential of getting a thread shut down. I was on a binge once long ago testing a dozen of the best and some off-brans designer oils and settled on the one I'm using now.

BUT my oil TRUMPS your oil and keeps my engines from BIDEN up!

Sorry! Couldn't resist! :laughing:

 

[newbury]

I am neither an automotive engineer nor a lubrication chemist, so what follows is purely speculation.

Start with the premise that the black color is bits of "dirt" in the oil. The more dirt that gets left behind after an oil drain, the more dirt is there to contaminate the new oil.

<snip>

Also consider how much of the oil you change. On my 7.3 turbo there is about a quart in the HPOP which doesn't drain for a normal oil change. Instant black oil after a change.