I have a Ford model 951 brush hog (5ft). I am wanting to change the gear lubricant. The manual calls for any of the following: Sunoco 850AEP, Gulf Mining HD Lube, Mobile EP023 or NLGI grade 000 EP grease. I aven't really found anything other than large drums or pails. I really only need a few quarts. I would appreciate anyone's input as to what an equivalent would be?