the transmission of my 89 560sel is leaking...... about 1 qt per 1500 miles. i let the mechanic to check and he quoted $850 for replacing the rear seal and the front seal... and also the front pump seal. will it be the right price in northern CA? or i should just live with it and save the $850 and pour one qt of atf per 1500 miles? or i can try those sealer that for sale in auto zone?