Diesel oil color

[cookand]

I know 99% of those here know this, but for those unaware (me not so long ago) I thought this could be helpful. I had a bit of a snafu installing a new drain system, ended up with a leak, and had to redrain, refill and reinstall. This is about 10 miles on M1 esp 0w20 on my ‘21 Sierra 3.0

 

[fantastic]

Carryover oil probably but combustion cleanliness on a diesel is not great. Thanks for sharing the pic.

 

[samven]

10 miles is pretty fast but I know my diesel tractor turns fresh oil black in the first 10 hrs.

 

[johnmyster]

It doesn't take much to look really dark in a milk jug that is 9" thick.

 

[cookand]

It doesn't take much to look really dark in a milk jug that is 9" thick.

ok. that doesn’t make sense to me. Here’s a top down view into same jug and view of dipstick with fresh oil (kinda hard to tell due to color of dipstick, but it’s almost clear with the green tint esp has).

 

[johnmyster]

ok. that doesn’t make sense to me.

Ok. Maybe change oil more often then.

Absorption cross sections have that pesky “per unit length” in the denominator.

 

[53' Stude]

I know 99% of those here know this, but for those unaware (me not so long ago) I thought this could be helpful. I had a bit of a snafu installing a new drain system, ended up with a leak, and had to redrain, refill and reinstall. This is about 10 miles on M1 esp 0w20 on my ‘21 Sierra 3.0

View attachment 279783

wouldn’t be concerned at all. Diesel engines turn oil black real fast. I never noted ESP had a green tint either

 

[burbguy82]

The oil should not be that black in 10 miles, no way.

Someone had neglected something somewhere

 

[Strumpan_]

All diesel oil is black the second you pour it in. Everyone saying anything different is lying. (According to me, I change 100s of liter of diesel oil every month.)

 

[cookand]

The oil should not be that black in 10 miles, no way.

Someone had neglected something somewhere

This is not correct. Bought this truck new and last 60k miles have been changed every 5k miles

 

[cookand]

wouldn’t be concerned at all. Diesel engines turn oil black real fast. I never noted ESP had a green tint either

Yep. Even has a green top on the bottle. Lol

 

[cookand]

Ok. Maybe change oil more often then.

Absorption cross sections have that pesky “per unit length” in the denominator.

From my original post, this is after 10 miles.

 

[53' Stude]

The oil should not be that black in 10 miles, no way.

Someone had neglected something somewhere

I don’t believe you for a second. Done many diesel oil changes. Hang around and work on some older diesels. Oil is black quick.

 

[53' Stude]

Yep. Even has a green top on the bottle. Lol

Which ESP are you using?

 

[cookand]

I don’t believe you for a second. Done many diesel oil changes. Hang around and work on some older diesels. Oil is black quick.

You can believe whatever you want to believe. Why would I lie? I’m just trying to post something helpful

 

[burbguy82]

This is not correct. Bought this truck new and last 60k miles have been changed every 5k miles

Well, 10 miles and black oil is not my experience with diesel engines. Maybe these new things are different. Understand, I dont mean that YOU have neglected the thing meaningfully, but maybe the oil you are using is not doing a good job, or something along those lines.

My last Duramax LML would take 1000 miles to look anything close to that. My Kubota stuff takes many hours.

 

[cookand]

Which ESP are you using?

0w20 esp

 

[burbguy82]

I don’t believe you for a second. Done many diesel oil changes. Hang around and work on some older diesels. Oil is black quick.

You can believe whatever you want to believe. Why would I lie? I’m just trying to post something helpful

what is going on here?

 

[cookand]

Well, 10 miles and black oil is not my experience with diesel engines. Maybe these new things are different. Understand, I dont mean that YOU have neglected the thing meaningfully, but maybe the oil you are using is not doing a good job, or something along those lines.

My last Duramax LML would take 1000 miles to look anything close to that. My Kubota stuff takes many hours.

Fair enough. Vast majority of folks here are more knowledgeable than myself. Just posting my results

 

[cookand]

what is going on here?

Good point. I replied before reading entire post