I have 86' 420sel with approx. 250K miles on it and was wondering what mileage I can expect from this engine? The valve job was done at 175K miles. Previous owner took great care of the engine, always used premium gas, scheduled oil changes,... The lower engine end remains untouched.
Also the same question goes to transmission? It was overhauled first time at approx. 150-160K miles.
Your valuable opinions will be appreciated.
Thanks.