I've seen people start fires by spraying WD-40 into a running electric motor. WD-40 is good for some light duty applications like door hinges but you are better off using oil for lubrication on machines or motors. I also recommend 3-in-one oil. That's what I use to lubricate motors with sleeved bearings.

Watch out.... you can ruin an electric motor with WD-40. Lots of people lubricate with that - but it's so fine that it gets into the molecules of the bearings and turns into glue. You need - at the very least - 3 In 1 oil for motor bearings.

WD-40 is for replacing water on surfaces. We burned up a lot of it when I was at sea keeping the steering apparatus clear of rust.

? ???? Hi from France ???? ? ?

It depends the parts where you put the oil. Sprays tend to put oil everywhere, contrary to one or two drops right on the spot.

Best

Cat.

this is not true as a generalisation. however some applications it is. e.g. where metal parts not only need a thin film applied but need heat to be taken away e.g. camshafts. pistons.

Please include the exact lubricant and machine being lubricated.