5w20 and valvoline synpower oil treatment question

[aztec12]

what do you guys think if i use 5w20 with a bottle of valvoline synpower oil treatment in my f150 4.6? will that take the 5w20 out of range(grade)or will it beef -it up nicely like i think it would.im not into the thin oil just yet thats why im asking this question (currently using castrol syntec blend 10w30)but with winter months coming and that ford recommends it i guess i will try it. well any comments please? .............

 

[94MaxGXE]

I think the valvoline synpower oil treatment has nothing to do with the "grade" weight of the oil. I would thing the synpower is just a dose of antiware and ditergent additives.
Dont waist your money on it, just use the oil and change it in the spring......back to the "blend"....

 

[mechtech]

Adding the synpower to your 5-20 would make a 7-22 or so weight oil [it's 40w alone].
I wouldn't worry about it at all.
Synpower has a nice additive package - won't hurt and could help. Smoothed the idle [1/2 bottle dose] almost instantly on a car I put it in.

 

[Motorbike]

I doped Amsoil 10w-30 with it two days ago when I changed oil in my Miata .

Look Mom , Amsoil now has moly

In this car at least .

 

[mikep]

Based on what we've seen here in UOA of various 5w-20 oils and Ford modular engines I don't understand the aversion to a 20w. There have been a couple 20w oils putting up consitently good, if not excellent wear results in Ford/Mazda motors that call for that viscosity.

I too was slow to accept the 20w oils and used mostly 5w-30 in my 2001 F150 (also a 4.6) for a while. That was at the beginning stages of the 5w-20 era and even some dealers were using 5w-30. Here we are a few years later and now have plenty of data to suggest the 20 weights are more than up to the task (some even better than their 5w-30 siblings).