I got loud knocking noise coming from the bottom of the engine when I started it up. The noise went away after 1 min but increased a little on acceleration. After 10 mins of driving engine shuts off and oil was flowing from the bottom of engine were tranny is connected. Better to replace motor right? What year engines work with 1998 Catera Model? Seen some listings on ebay most say 1999- 2001 3.0 but I thought they had 3.3L on those models and My Vin has R in 8th digit. What other parts should be replace while changing engine? oil cooler? timing belt and tensioner? If I spend the cash I want at least 40,000 miles of trouble free performance. Somebody I know you've been there. Help!