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got this yellow / brown sludge in the oil filler tube. Bit of research shows is's moisture, and that it's usually not harmful.
Thing is I never drive short distances and the oil, 0W40 Motul 8100 XMax, is changed every 6k miles / yearly. Still accumulates a lot of moist apparently, normal?
And what's the best way to clean it? Ttaking the filler out is a pita...
Normal. I suppose you can remove the tube and clean if so inspired. I would not clean in situ for fear of dropping something down there. However, I never have on any of my cars and have driven many 100k miles.
concur about the moisture. motor oil has additives that by design absorb moisture.
What is your definition of "short distances", does the oil reach operating temperature, and how long is the drive after reaching the oil's operating temperature?
concur about the moisture. motor oil has additives that by design absorb moisture.
What is your definition of "short distances", does the oil reach operating temperature, and how long is the drive after reaching the oil's operating temperature?
The drives are typically 1-1,5hrs long. Oil is up to temp after about 20-25 mins depending on the ambient temp. I stay below 2,5k rpm during warmup, when warm it’s being used.
I would not worry about cleaning it. Moisture is condensing on the inner tube wall due to the tube being exposed to ambient air. Then it mixes with the oil/air mixture inherent in ICE.
I would suggest going to oil and filter changes every 6 months and see if that makes a difference.
I would not worry about cleaning it. Moisture is condensing on the inner tube wall due to the tube being exposed to ambient air. Then it mixes with the oil/air mixture inherent in ICE.
I would suggest going to oil and filter changes every 6 months and see if that makes a difference.
you might also check that the crank case negative pressure (at the oil filler neck is where it is tested on my 997.2) is within spec so that the AOS is operating properly. In addition to its primary function of separating oil from the blowby gases before flowing the air back into the intake manifold, the water vapor from combustion that is suspended in the blowby gases is also routed into the intake manifold. Of course some of that water vapor finds its way into the oil. If the AOS is not operating at the correct negative pressure, is inefficient or has failed, then there will be some symptoms.
you might also check that the crank case negative pressure (at the oil filler neck is where it is tested on my 997.2) is within spec so that the AOS is operating properly. In addition to its primary function of separating oil from the blowby gases before flowing the air back into the intake manifold, the water vapor from combustion that is suspended in the blowby gases is also routed into the intake manifold. Of course some of that water vapor finds its way into the oil. If the AOS is not operating at the correct negative pressure, is inefficient or has failed, then there will be some symptoms.
Just a last thought.
thank you, I’ll look into how to test for neg pressure on the .1. guess it’s also done at the oil filler neck. I’ll post back if I find anything.
Make your own tester. Pickup a manometer on Amazon $40 US, buy an oil filler cap, take the screw in nipple the manometer comes with and install it in the top of the old or new oil filler cap (drill a hole and use RTV/silicone to seal it in). You now have a new tool in your box.
Make your own tester. Pickup a manometer on Amazon $40 US, buy an oil filler cap, take the screw in nipple the manometer comes with and install it in the top of the old or new oil filler cap (drill a hole and use RTV/silicone to seal it in). You now have a new tool in your box.
sorry for the late reply, thank you. Just ordered a manometer and will test the pressure.
06-09-2023, 06:27 AM
Yellow sludge oil filler tube
