manual just says replace oil every 50 miles...no grade mentioned...but...summer can be 30 weight and winter 10 or 20 w 30 makes sense. use detergent if motor is rebuilt and maybe conside non detergent if engine is well run or worn...does anyone disagree????
Where Are You From? pa.
Do You own a car built by Durant? yes...1929 DURANT 60 AND 1924 STAR TOURING