I just bought 4 tubes of JD Corn Head Grease for around $16 including shipping here: https://www.greenfarmparts.com/John-Deere-Corn-Head-Grease-AN102562-p/an102562.htm
Use gear grease/rearend lub! If just oil,under 70 wt.=too thin an leaks out most likely,if wheel bearing grease=too thick an just gets moved aside an then dose not lub.........
You know, some things you just can't wash off! [emoji33] LOL Sent from my Moto Z (2) using The H.A.M.B. mobile app