Quote:
snarf said:
I only adjust oil on the basis of a cold reading with the car level. I've read somewhere that overfilling is to be avoided and my dealer advised not adding any oil before level dropped two bars. However, as each bar on the guage is equivalent to 0.4l I add just 0.2l when the reading falls to one bar below full. Upto now this has always taken it back to full and never given an overfilled reading.
Snarf,
I do the same thing, adding only 200 ml when the gauge level drops 1 bar. I think that the measuring device puts out a signal that is rounded when converted to the display, that is, if the oil level is down more than 200 ml, it will show that the level is down 400 ml. And if the level shown is full, in fact the level could be down, but by less than 200 ml.
For cars that burn a bit of oil (and most of the 997's do), you get some gasoline mixed in with the oil. If the engine stays hot for a while after driving, a "full" reading might later become a reading of "down 0.4 l", as the gasoline mixed in with the oil evaporates, which leads to a lower reading. I have had this happen to me many times, as I park the car in a small garage that has little ventilation. The engine retains a lot of heat for a long time, thus leading to the evaporation of the gasoline. Usually after several days, when the engine is definitely cooled, the gasoline vapors condense and thus raise the reading of the oil level back to "full."
Jim