What Oil do you recommend? New tapping after 5k on oil change.

So i usually put the regular mobil oil...cheapest from walmart...just did the oil change 5k miles ago and this mourning i hear a loud tapping noise from the engine....Last time i had this problem it was cause i ran rotella t6 mixed with lucas oil stabilizer .... ran that up to around 15k when i heared the tapping....changed back to just t6 and havnt had the issue for over a yr .... Pass couple months i had switched back to that mobil n havnt had the issue till this mourning.

I heard that it could be the coolant temp sensor not reading correctly for the injectors to fire in the proper order but my temp sensor is only a couple months old ...got it new from freightliner.....Also my injectors are only about 2yrs old n always put hot shot secret on every fill up and sometimes howes. Is it a oil problem? What you guys think?

 

Where do you buy that?

 

30-35k?!? waoww thats crazy!! what about the filters??

 

idk but when i removed that oil with the lucas it came out like water and noise went away with some fresh oil

 

I guess man maybe just bad fuel? This past fill up had lots bio diesal