[jeffery.forney]

I'm going to ask a newbie question, I accidentally purchased 5 qts of motocraft 10w30 power stroke oil. Am I ok to mix 5 qts of that with my remaining F150 Motocraft 3.0 diesel 5w30 oil from my previous oil chance I didn't use? Do I need to try and return my 10w to rockauto and buy matching oil?

 

[jmperlik]

@jeffery.forney - pretty sure the 10W30 is partial synthetic and 5W30 is full synthetic, researched in Post #13 in the What oil are you guys using? thread. I'm no chemist, so I can neither confirm nor deny your plan, but if I were in your position, I would not be mix-n-matching, but that is just me...

 

[beaker]

@jeffery.forney - pretty sure the 10W30 is partial synthetic and 5W30 is full synthetic, researched in Post #13 in the What oil are you guys using? thread. I'm no chemist, so I can neither confirm nor deny your plan, but if I were in your position, I would not be mix-n-matching, but that is just me...

It is interesting that the 5W30 is advertised as a "full synthetic" whereas the the 10W30 is not. In the technical description, they read exactly the same "formulated from synthetic base oils.

Very small data set here but I mix viscosity all the time. My latest oil change a couple weeks ago was on a non-Ford 3.0L diesel with a 7.7 liter oil capacity. I used 6 liters of 5w-40 that I had on hand, but then topped off with 1 bottle of brand-specific 5w-30 and one bottle of brand-specific 0w-30 because I had it laying around. I look at it a lot like filling your tank with regular unleaded and then adding 15 gallons on premium unleaded a couple hundred miles down the road. You will end up with something on the order of 89 octane gasoline and the car will be happy either way.

 

[Laytunes]

If they are both of the FA-4 variety, then it would be fine to mix. combined you may have a slightly lower cold viscosity, call it an 8W30 oil haha. It won't hurt anything.