replying to Fred, Spannerman wrote:
Fred, The Titan is the new version of the old Challenger model. I've had my
Challenger for nigh on 20 years and used very regularly and still going. I
have found Makita Hammer Grease the best. I have attached image of the user
manual, it suggests to check level every 6 hours use, I have found that to be
excessive every 40 hours of use should be sufficient. Over filling will
result in excess grease ejected via the chuck. Hope this helps.
https://www.homeownershub.com/img/jv