It's time to bite the bullet and replace the head gasket in my 1992 300E (103.983 engine). The oil leak is at the rate of 1 quart every 3-500 miles, but, coolant seems to be staying at a constant level with no overheating. My trusted independent is quoting $1000.00 to fix it. Does this seem to be a realistic price. If any of you out there have done this I'd sure like your feedback. Thanks in advance.