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Old 09-27-2019, 03:23 PM   #1
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Water in Oil in a V10

I was having an inspection on a Newmar on the F53 chassis and the inspector noticed the signs of water in the oil. He saw the oil looking brown and creamy on the oil filler cap. The coach had a recent oil change and the oil on the dipstick looked fine.

My question is: Is a problem on these engines after sitting for a while to have any condensate in the oil system? Has anyone noticed a brown creamy oil residue on their oil filler cap.

Thanks for any help on this, as otherwise this seems to be a good coach.

Tim
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Old 09-27-2019, 03:48 PM   #2
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It happens. Condensation can build up under the cap.

Get a oil sample and have it tested.

If there is any amount of water or coolant in the oil, loosening the oil drain plug would let you see it dripping out. That would be excessive.
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Old 09-28-2019, 07:15 AM   #3
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Low mileage with a lot of short hop driving can cause this. People that start the motor and idle it routinely during non use periods can also get this build up.
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Old 09-28-2019, 07:30 AM   #4
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Condensation that causes a oily creamy buildup on the inner side of the oil fill cap is not unheard of and it is usually harmless if regularly cleaned off. Running an engine regularly and allowing it to come up to full temperature can help reduce the occurrence.
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Old 09-28-2019, 03:31 PM   #5
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The oil fill cap is pretty far from the engine and in a cool area in front of thee radiator. So it gets condensation from the crankcase condenses on it. I see a little brownish foam on mine.

If you are consuming coolant and the oil is a little brownish foamy when you change it, then start worrying..
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Old 09-28-2019, 09:37 PM   #6
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That exact same residue would be found on the oil caps of my air-cooled VWs, back in the day. Simply condensation.
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Old 09-29-2019, 12:15 AM   #7
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Thanks for replies. It will set my mind at ease. I thought that it might just be condensation, I wanted to make sure it was normal.

Tim
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Old 09-29-2019, 06:23 PM   #8
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Check to see if your oil level shows above the full mark on your dipstick. If so, you could have a crack in the oil cooler unit.

I've never seen anything like you describe on the oil filler cap on my 2000 coach.

Good luck and safe travels...
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