I don't remember, exactly. I just remember that I read a lot of forum threads on the subject when researching it for my RZR, and the general consensus was that Mobil 1 Synthetic was the good stuff.Well I have to ask...why Mobil 1?
I think the ACE uses the same filter as the RZR 570, but am not 100% sure.
I've seen UNI filters for the RZR 570 advertised but the picture doesn't look right so I haven't jumped on one to try it.
Sorry, I should have said RANGER 570. The UNI website lists the NU-8520ST as being for the Ranger 570.The filter for the ACE is different than the RZR 570.