Originally posted by allirroz
... I just wanted to point out that the manual may show the indicator "HI" fault. Which he may have overlooked to refer to.
Anyhow looked at my manual and found nothing on "HI" either.
It is explained in both of my manuals, and it's on page 82 of the online version that I've posted here.
Don't ignore it!!! Foaming oil can starve the motor and cause major damage.

Originally posted by allirroz
Question now would be what model C and what version does he own Euro or USA?
Yes, it would help us help you if owners would put their general location, and the car's year and model in their profile.