LIGHT ENGINE OILS for Improved Subzero Operation 500173
STARTING ability of engines is improved when 5W oil replaces 10W oil at low temperatures, according to the author. In fact, he reports that the average increase in cranking speed is 33%, in comparable engines under similar conditions.
At the same time, he shows, there is only a moderate increase in oil consumption and no significant increase in wear with the 5W oils.
