In the UOA section the Nissen 1.8L has a 2 3/4 quart capacity. This got me thinking. Would this be a real plus as the oil gets to operating temp very quick and stays there. UOA have been very good on these cars. Both my older cars have 6 quart capacities. My new Miata has a 4 quart which seems to do well. Is this a trend? Is this why we are seeing smaller oil filters? My old 1952 Jaguar took 18 quarts. Things are sure changing.