Hello all! Melissa-nice access panel photo! Serg-You are correct-all jiffy lubes, fast lubes, speedee lubes, etc suck! I have seen 1 Valvoline Fas-Lube that was a great oil change station, but that is a rarity. And I still don't know if I would take them my Landy. I've heard that the AC Delco filter does have anti-drainback valve. (One of our company mech's told me, (He's a rotella boy!)) You all should hear the stories of "Oil changes gone bad" from my friend @ local salvage yard. "Yes, I was almost sure I put that drain plug back in" and the famous "I thought Jimmy was the oil tech on tuesdays!" Hours of excuses, recited in their original hillbilly dialect, can be found from the man who recieved these cars & sent them to their final resting place! Just another reason why I change my own oil. BTW, the D1's drain plug should, @ that size be properly referred to as a "****". Thank You! LRW.