Change Oil Warning won't go away.

Have you checked with a mechanical gauge to see what your pressure is? You might actually have low oil pressure.

Since there are various different warning lights exactly which warning light is appearing after 20 minutes?

If it is the oil service warning light that is appearing then that has to be reset manually when the oil service is done.

It is a low oil warning I would guess.

Do you mean oil change warning light or oil pressure warning light?

You will have to take an oil pressure reading and compare to specifications. It could be that the pick up screen is plugged. Do not drive the car as damage to engine will occur.

Do not assume that the low oil pressure warning is a false one or that you only have a faulty oil pressure sensor. Your engine may in fact be running with low oil pressure once the oil heats up and thins out. 8-10 miles of running is enough to get the oil hot. It is significant that you only get the low oil pressure warning once the engine oil is warmed up.

If the oil pressure in the engine is low, engine lubrication will be impaired and the engine can be badly damaged so you need to run an engine oil pressure check.

1. How long has it been since you have changed the oil in the engine? If it has not been changed in the past 6 months then change it and change the oil filter at the same time. You must only use the oil specified by VW for that particular engine.

2. When new oil is heated it thins. If it is old and contaminated it will be even thinner when warm. You will get less oil pressure when the oil is thin and hot and more oil pressure when it is thick and cold. Fresh new oil is a little thicker as it has not been diluted with petrol and other contaminants.
Oil pressure also varies with engine speed (RPM). At idle or low engine RPM the oil pressure is lower.

3. OIL PRESSURE CHECK
After the oil is changed the car needs to be run to check if the oil pressure warning still appears. (I suspect that it probably will). If it does appear then an independent oil pressure gauge needs to be connected up to the lubrication system in the car to check the engine oil pressure. This is best done when the engine oil is hot because this is when you are getting the low pressure warning. Any competent mechanic will be able to do this. ( The useless ones will not). The oil pressure can then be properly checked on the gauge at various engine RPM. If there is a low oil pressure reading from the gauge then there could be a problem with the oil pump, the oil pick up or the oil pressure relief valve in the engine.

4. You mentioned that you see the oil pressure warning disappears once you accelerate. I suggest this is only occurring because with an increase in engine speed (higher RPM) the oil pump speed is increasing and the low oil pressure problem is being overcome temporarily. However as soon as the engine RPM drops the oil warning will appear again which means the engine is running with below minimum oil pressure at that RPM.

Even when you get no warning, the oil pressure in the engine could still be running significantly below the optimum level.


5. It is possible that the oil pressure is fine and that the problem is an electrical gremlin as these cars suffer from a variety of electrical faults. However from what you have described I think there is a problem with low oil pressure in the engine and until it is properly checked it is unwise to assume that you are just getting false oil pressure warnings.

I hope this helps.

if only warning level oil is on , is not problem , in oil engine carter have a level sensor , securely is dirty , change it . now if RED oil warning is on,, Stop engine

scroll through the diagnostics using the up and down arrow in the right side of the radio till you reach the percentage of oil left then hold the CLR button which is the circle inbetween those arrows till it resets.

Hi,
This is most likely because although you changed the oil you didn't reset it. Do this by turning the key all the way forward without starting the engine push the gas pedal to the floor 3 times in 5 seconds wait a second then turn key off then start the truck light should flash then go away.
If you still need assistance let me know.
Thanks,
Lee

did you check the engine oil level? has it had an oil change resently? check oil preasure, service engine and see if problem goes