and dexronIII and even the new dexronVI, the new dexronVI is backwords compatible and can be used in any transmission calling for dexronIII just like +4 can be used in +3 applications, except im told dexronVI does not have as many friction modifyers in it as +4 does hence it allows for firmer less slippery shifting and being that it is a synthetic it handles heat and can go alot longer.