sooty oil?

[L79racer]

What is the cause of this? This is fresh oil with six 1/8 mile test hits. Amsoil 10 40. The oil looks black. the picture is right as I tilt the bucket to one side and let the oil flow to the side. You can see all this soot in the oil. Is it contamination from blow by as I did have a cylinder leaking down. I was just running e85 for the first time.

[Chevy55]

Being no one answered my suggestion would be to get a sample and have it annualized.
When I use to deal with Black Bear in Farmingdale they'd run samples, no charge.
Also you could ask at Motorworks, Sunrise Highway, Amityville if they'd do it for you.

That's all I have!

[L79racer]

Originally Posted by Chevy55

Being no one answered my suggestion would be to get a sample and have it annualized.
When I use to deal with Black Bear in Farmingdale they'd run samples, no charge.
Also you could ask at Motorworks, Sunrise Highway, Amityville if they'd do it for you.

That's all I have!

Thanks, for responding. I showed a friend and he said it was definitely contamination from bad ring seal. Motor is coming apart. I had a few cylinders with some bad gouges at the top of walls.

[Todd Gross]

Did you run a break in oil prior to putting the Amzoil in? Some of them, such as Driven BR will leave traces of dark oil suspension.

[L79racer]

Originally Posted by JMan

Did you run a break in oil prior to putting the Amzoil in? Some of them, such as Driven BR will leave traces of dark oil suspension.

Ive been running amsoil in the motor. It was a fresh oil change not a new motor.

[1320racer]

Originally Posted by L79racer

Ive been running amsoil in the motor. It was a fresh oil change not a new motor. I showed a friend and he said it was definitely contamination from bad ring seal. Motor is coming apart. I had a few cylinders with some bad gouges at the top of walls.

why would you tear an engine down that is otherwise running fine, because of "sooty oil" and the opinion of one as to why?

Do a leak down first.

[carl hinkson]

Originally Posted by 1320racer

why would you tear an engine down that is otherwise running fine, because of "sooty oil" and the opinion of one as to why?

Do a leak down first.

Yes a leak down at TDC and about 40* before TDC is a good place to start.

There are a lot of shops out there that do not believe in plate honing!!!!

[L79racer]

If you read into my first post I said I had a cylinder leaking down. I did the test and found I had a problem. Pulled the head and had gouges in the cylinders causing the leak down. So when I drained the oil I found the sooty stuff in it. I just wanted to confirm it was combustion contamination in the oil. So I torn the motor down and will be pulling it shortly. I am in the process of building a new LS motor so timing was kind of ok in a messed up way.