Originally Posted By: oily boyd
Regarding oil filter changes, the GM Service Manual for the 2007 Saturn Sky (also EcoTech engine) states: "Inpsect the oil filter cap O-ring seal for damage, replace as necessary".
I would agree, replace only if necessary. I'm currently at 100,000 miles and have not replaced mine; it looks good and still appears to fit properly and I have no leaks. Perhaps I'll replace it next time just because I'm at 100K.
Same with the filter cap. I've seen a few that looked like someone took Vise-Grips to them, or maybe tried to chew them off with their teeth. With a little care and the proper socket, the cap should last a long time (Hint - don't use a standard size socket because on some cars the intake runners are in the way and the socket will fit on the cap crooked, and possibly damage it. Use the special low-profile socket).
Also remember to lube the little O-ring on the bottom of the filter with oil before installing the filter back into the engine.
And since I had the picture handy here on my computer, here's my shot of a Pure One and an AC Delco: