Need to top off my 4.0 Jeep...I'm running 5w30 STP High mileage from Autozone since it was a good price with the filter, but a quart of it there is like $7. What's something that's pretty similar? I know anything will mix but thought I'd try to match it up a bit. I think the bottom of the STP bottle had the Warren logo so I'm thinking Supertech high mileage might be similar?