maxlifeengine protector and 5w20 mix?

[aztec12]

I just added 15 oz. of valvoline maxlife engine protector to the factory recommended 5w20 in my 1998 4.6 f150.I wonder what grade the 5w20 went up to,and most important was this a good thing i did to the oil? tks

 

[TN Tracker]

I've got Maxlife Engine Protector and 5w30 Motorcraft in my Tracker. Seems to be doing well and startup noise is now almost non-existent.

 

[mechtech]

Depends on how much you put in - 7-22 or so.