Hello. My car is a 1995 Buick Park Avenue with the normally aspirated 3800 Series II engine. I purchased new in March 1995. Dino oil used with 3,000 oci until 20,000 miles, then 10W30 Mobil 1 with 5,000 oci. Now has 260,655 miles on odometer. Never burned a drop of oil. One-hundred percent...