Before getting to the issue, a quick note: I really love my XC90, which I bought new 20 years ago ( 312000km driven so far), and I’m trying to keep it running for as long as possible.
Last summer, for cost reasons, I replaced the swirl flap myself. It had already been replaced once at around 150,000 km at significant cost at a workshop.
During that job, I removed the injectors and sent them in to a Diesel injector specialist for testing. According to their report, all injectors were worn and had to be refurbished.
About 4–5 weeks after reinstalling the injectors, I got the warning message “Oil level too high.” The oil level on the dipstick was indeed above the maximum.
Before this, the engine had an oil consumption of just over 1 liter per 10,000 km, which I would consider very good given the km on the clock..
I initially suspected the injectors, as oil dilution due to leaking injectors is often discussed online. However, the injector service company told me that oil dilution is more likely caused by post-injection during DPF regeneration. Leaking injectors would usually cause rough running and fault codes, which are not present. They therefore ruled out injector issues.
I continued to monitor the situation and performed an oil change at 305,797 km as a precaution. About two months later, after roughly 3,500 km, the warning message appeared again.
There was also a lambda sensor fault stored, which I addressed (leaking intercooler, lambda sensor confirmed defective). Unfortunately, the oil level issue still remains.
The warning reappears after about 3,000–3,500 km each time.
I checked the state of the DPF and the injectors via Vida :
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Does anyone have an idea what else could be causing this?
Cheers
Phyrros
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