Joe. I have a FW and a 15-91 manuals for both say to use motor lube. If I use Vaseline do you just pump until it starts to seep out or is there an amount. I don't see anything in the manual other than motor needs lubed. Also how often does it need to be done? Probably depends on usage I would imagine. Can you tell by the sound of the motor when it needs lube? Does it whine? does it get sluggish or pull harder? Now my FW has a tube of lube that appears to still be soft. Do I dare use that?