Hello fellow diesel mechanics,
I would like to know how the following values in the switchboard enclosure (17) should be interpreted.
WIV: Minimum oil level within the maintenance interval: 1560 ml.
WIV: Maximum oil level during the maintenance interval: 1900 ml.
WIV: Long-term average of oil level differences: 1850 ml.
Background:
After the NOx software update last November, along with an oil change, I've been experiencing the following issues:
More frequent and more intense DPF regeneration.
Smell of burnt rubber when regeneration is interrupted.
The vehicle initially doesn't respond to acceleration, and then, when you release the accelerator, it momentarily surges forward, especially during cold starts and shortly before the regeneration cycle.
GRA's regular oscillations decrease as fuel consumption drops below 1 liter per 100 kilometers.
Idling with a slight increase in RPM just before regeneration.
Oil consumption - before the update, I had a slight oil consumption issue.
Smell of soot (campfire/fireplace) inside the vehicle after a short distance (gets stronger with more oil).
Cold starting problems in sub-zero temperatures.
Vehicle: My Passat 3C 2.0 TDI (CBDC), manufactured in 2009, with 217,000 km on the odometer.
The symptoms worsened about a month after the update, during the winter, and the oil level was already at the maximum mark. After a long 2000 km highway trip for skiing, the oil level was only slightly above the maximum mark shortly after parking. I also had an appointment with the dealer at that time, and the other symptoms were also improved, despite the freezing temperatures overnight.
Since the oil level was again above the upper mark on the dipstick after a month and even longer, I looked up the relevant values in the control panel and read them out. Then, I asked the workshop to drain the oil and, after refilling it to the "max" mark on the dipstick, read the control panel again.
The WIV values are likely long-term average oil level readings (so that the oil level warning light doesn't come on at every hill). The ml values cannot be absolute, or the mechanic always calculates 3 liters of oil too much during an oil change
. The mechanic said that approximately 700 ml fits between the min and max levels in my car.
You would need (my guess) the oil level to be above the point where the warning light comes on.
Does anyone know how much oil can be added between the minimum level indicator and the maximum level?
"Definitely, anything exceeding this absolute minimum by 1560-1900 ml is definitely too much, isn't it?"
I would like to know if I have oil contamination from diesel in the oil, and if the injectors are dripping after the update, or if the workshop simply meant well and filled too much oil. Unfortunately, I didn't check properly immediately after the workshop visit, because I thought they would have taken care of it
.
The values in the first log, before, appear to indicate that the oil level during the maintenance interval was always at least 200 ml above the maximum level of approximately 1350 ml (according to the second log). This would mean that I only added a maximum of about 300 ml of diesel to the oil over approximately 10,000 km. Is this okay, or is it already concerning? ...Or is the oil level sensor not accurate enough to estimate the amount of diesel entering the oil?
"By the way, the injector calibration times only changed within the normal variation range before the update. Also, the fuel consumption hasn't increased more than usual from one winter to the next (probably around 1.5%, likely due to increased back pressure from the DPF, which is constantly filling up with ash). I'll post an update on that sometime."
Thank you for your help.
Christoph.
Bookmarks
Links
Garage
FAQ, Legal Notice & Privacy
RSS Feed
Register
Login
