Catch Can has a surprising amount of milk

[WVracer]

So I just bought this car not too long ago. LS3/M6 (72k miles on it) It supposedly has a TSP F-35 cam (from word of mouth of seller, I plan to pull the cam and verify later) and apparently it used to have a edelbrock supercharger that has since been removed that he didn’t mention and maybe didn’t know about since he was the second owner. I learned based off the tune that came in the car since it still had the edelbrock map in the tune. I’m also suspecting they were pushing enough boost to push oil out the rear main since the back of the oil pan was covered when I got it but it’s not currently leaking.

I’ve been slowly getting the tuning fixed and it runs a lot better. I installed a Elite Engineering catch can since I seen lots of blow by in the intake and changed all the fluids (oil, trans, diff, brake, etc).. I’ve since driven the car about 600-1000 miles or so. Today I opened the catch can to see this much oil. I’m guessing it’s milky from condensation, but it’s the amount that actually bothers me. Not only that but I’m down halfway on the dipstick which I could’ve swore was completely full when I changed it. So it’s not all disappearing through blow-by. I’ve heard of LS’s eating oil like that but I’ve never seen one actually do it. I guess I’m going to have to keep an eye on that and hope I made a mistake reading the stick when I first filled it. Might have to do a leak down test and go through all the valve seals. I don’t see oil in the exhaust plume but it’s cold here so there is too much condensation to really tell. Either way, I guess it’s nice that milk didn’t make it back into the engine. A testament to always be in-tune with your car.

[George-CZ]

Originally Posted by WVracer

So I just bought this car not too long ago. LS3/M6 (72k miles on it) It supposedly has a TSP F-35 cam (from word of mouth of seller, I plan to pull the cam and verify later) and apparently it used to have a edelbrock supercharger that has since been removed that he didn’t mention and maybe didn’t know about since he was the second owner. I learned based off the tune that came in the car since it still had the edelbrock map in the tune. I’m also suspecting they were pushing enough boost to push oil out the rear main since the back of the oil pan was covered when I got it but it’s not currently leaking.

I’ve been slowly getting the tuning fixed and it runs a lot better. I installed a Elite Engineering catch can since I seen lots of blow by in the intake and changed all the fluids (oil, trans, diff, brake, etc).. I’ve since driven the car about 600-1000 miles or so. Today I opened the catch can to see this much oil. I’m guessing it’s milky from condensation, but it’s the amount that actually bothers me. Not only that but I’m down halfway on the dipstick which I could’ve swore was completely full when I changed it. So it’s not all disappearing through blow-by. I’ve heard of LS’s eating oil like that but I’ve never seen one actually do it. I guess I’m going to have to keep an eye on that and hope I made a mistake reading the stick when I first filled it. Might have to do a leak down test and go through all the valve seals. I don’t see oil in the exhaust plume but it’s cold here so there is too much condensation to really tell. Either way, I guess it’s nice that milk didn’t make it back into the engine. A testament to always be in-tune with your car.

Attachment 1089765

If the engine is OK, this emulsion is formed due to short runs, when the engine is not enough to warm up and moisture from the oil is not enough to evaporate.

I would thoroughly clean everything and perform a few test runs, when the car and especially the oil warm up sufficiently.
Then I would check it again.

[George-CZ]

Otherwise, the amount of oil catched over a given distance is about the same.