1997 Buick Park Avenue Owner's Manual - Page 277

It's a good idea check your engine oilevery time you to get fuel. In order to get an accurate reading, themust oil be warm and the vehicle must be level ground. on Turn off the engineand give the oil few minutes a to drain back into the oil pan. If you don't, the oil dipstick might not show the actual level. Checking Engine Oil Pull out thedipstick and clean itwith a paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level. 6-13