Is this piston Slap?? (short video)

[bmf]

Hi Piresito,

Yes oil level is right , maybe slightly over max mark, currently with 20W50 oil, still very low pressure.

Waiting for my replacement pump to arrive.

[piresito]

Isn't that oil too heavy for the GS500?
10W40 is recommended, some use 15w40, but 20W50 is a bit on the higher limit, isn't it?
Maybe the oil experts can drop here their opinion...I don't know shaZam! about oil weight vs pump pressure and how the oil pump works in the GS500!