Minor issues with the 911.1.After a certain number of years, combined with aggressive driving, the brushes and bearings of the engine compartment fan wear out excessively, causing the fan speed to stall and affecting engine cooling. The overall oil temperature will be 5-10 degrees higher. If this happens, don't panic. Open the engine compartment to see if it is turning. Give it a tap and it should continue to turn and work. (Avoid aggressive driving to prevent excessive oil temperature.)