Hey Guys. Bought a new 3038E last summer and have noticed several mentions to let tractor idle before shutting down. Will this really pro long life of tractor? Also bought a new RC 6000 rotary cutter at the same time and was surprised when lubricating grease zerks for the first time. Went to grease zerk at end of shaft near gear box on universal joint and didn't find one. Only plastic one on shaft cover. Dealer said there is not one on rear universal and owners manual only shows the one on plastic shield. I have always had one on previous bush hogs on rear universal joint. Anybody else ran into this?