Take it from a guy who is starting on his 4th season of glove repair for a State Championship high school baseball Team. Get some Lexol from any auto parts store. I use the Lexol spray on conditioner, and on really dirty gloves I use the Lexol spray on cleaner as well.
No leather gets abused worse than baseball gloves. They get wet, they dry out, they get sweated in, dirty, etc... Lexol does a good job of keeping it right without making it too heavy or weakening the leather.