Just made the switch from Castrol HM 10w30 to MaxLife 10w30 tonight in my nice low mileage Buick Lesabre 3.8 with 293,000 kms!!! Just bought the car a month ago and made a nice long trip of 5200kms on it over Christmas. It used NO oil on the trip at all, in fact the level on the dipstick was the...