I wanted to grease the front end of my 1950 cadillac, and right off the first try, they were so caked and old they wouldnt accept any new grease. Saw a guy online heat the area up with a propane torch and that softened up the old stuff and new grease went in like a charm. (Heres the link). My concern is, is it too risky in terms of catching stuff on fire for an old engine bay thats covered with old grease and oil? I think it should be okay. How long do i heat it?