Think my oil may be past it's prime - just had a run back to London from Swindon this morning, managed an average speed of 86mph over 96 miles in an hour and fifteen minutes (part 50mph traffic), call it a road test.
The temperature reading on the oil got up to 118 degrees, and the mpg down to 26, just checked the oil and water, and although the oil level is reasonable, may need a top up, it looks like it may have burnt?
There is a semi - not quite tar looking glaze on the (not technical) bits inside the engine when I remove the oil cap.
Is this a problem, a common occurance or easily rectified? I have no idea of the type of oil in the car, or any of the technical stats regarding its past. Owned it six-eights weeks and it runs fairly well, although in need of a service, an opportunity to sort the oil out I think, but what oil? The car has 106k and is I believe unmodified.