If your retrieve is rough it isn't because the drag needs service. But the main and pinion gears do, so you might as well do both jobs at once. Shimano Ace 2 Drag Grease is a thick sticky cosmoline grease for fiber drag washers and it's what you should use on them - not regular grease. With regular grease, a fiber drag system gets jerky pretty quickly. If you go with Carbontex washers, they don't need grease but a light film of grease is OK. For the main gear and other general grease needs, I like Superlube grease. It's a white PTFE bearing grease sold at auto supply stores including NAPA and it works great (several good reel shops use and recommend it). Now, all this may fix your problem or it may not. I bet your reel needs 100% disassembly, cleaning, and lubrication. Other sources of rough retrieve can be the levelwind system and the instant anti-reverse bearing. If you aren't comfortable taking apart a reel, consider sending it to a pro for cleaning and lube. If you want to do it yourself, get a reel diagram, take it apart on a towel so the small parts won't "wander off". And lay parts out in groups as you take them off so getting it back together won't be a puzzle. Getting the job done and using a reel that works great again is its own reward.