There has been some talk here about Valvoline oil supplements, so I checked the Valvoline web site and they apparently have three oil supplements and engine treatments! One is a MaxLife oil supplement, another a SynPower oil supplement, and then a SynPower engine treatment.
How good are these oil supplements? If used with Valvoline motor oil do they bring the Valvoline motor oils up to a level comparable to Pennzoil and Castrol?
How good are these oil supplements? If used with Valvoline motor oil do they bring the Valvoline motor oils up to a level comparable to Pennzoil and Castrol?