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I have a 2010 pathfinder 2.4 with 98000 miles on the clock, it drive good and pulls strongly with no smoke. I have found that over a period of roughly 12 days around 300ml of oil will be caught in my catch can. I don't get blue smoke when I start the car and it starts with out a problem. This oil is then going around the hole inlet system even with the catch can.

My thought was it might be a leaking injector, allowing pressure from the cylinder to pressurize the crank case.

The oil in the can also has lots of bubbles in it and is a mixture or gray and black in colour.

Any thoughts.
 

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Higher mileage engines have more blow-by, which produces more crankcase pressure. Potentially filling your catch can quicker. 300ml in 12 days is a lot. How many miles did you drive in those 12 days? I don't have a catch can on my pathfinder, so I have no direct comparison. On my much newer Ram 1500 pickup with a 5.7L Hemi, I can go a whole oil change interval (7k miles) without needing to empty the catch can.
 
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