Presumably if you have a mechanical knock there is play in a joint. Grease will quieten it for a while, but gradually be squeezed out, so knock returns ?

My 2011 Mazda 2 has a knock on the steering, when turning large amounts at very slow speeds. I know this is the intermediate steering shaft, just like the mk7 Fiesta. I sprayed some lithium grease on the top joint and it went. But it came back after a couple of days. I'm just wondering if this spray grease was not very good or does it need a new part. If I do take the shaft out and clean it, what kind of grease should I be using?

I guess a new part is the safest. I don't imagine it will be cheap from Mazda. Thanks for any help

I assume you mean the steering column bottom joint, usually a universal joint, once they knock they have to be replaced as the play in the joint only gets worse, greasing will make no difference, quieten for a while is all it will do.