well i try to clean the crankshaftwhat you think? think i can get away with it.and should i change all of them or just that one? i was told to put 20W- 50W u think that a good idea? im in floridia

 

It looks pretty good. How does it feel smooth, slightly rough to drag your finger nail across the journal width, or bumpy feeling? If you can get some plastigage, you will know better whether it will work or not. Journal OOR is 0.0004" and connecting rod-journal oil clearance limit is 0.002". Pretty fine tolerances!

It would be easy to pull one other bearing and check condition. If OK, reassemble.

If it works it'll probably work as well w/ 5w-30 and 20w-50.

good luck