There are some problems with the settings at the beginning, but the speed is good, especially on a wide track is easy to accelerate. But there is one thing that is very dependent on oil. My friend took the same and just poured universal oil, but not here it was, constantly puffed and the speed dropped significantly, so it is necessary to pay attention to the oil and in case of what to choose specifically for it. I stopped at the Valvoline Premium Blue 8600 ES SAE 15W-40, because it has not yet had problems with speed and so on. But here it is necessary to look individually, considering the mileage and so on. So you can read about the best oil for duramax carfluidsexpert.com/top-5-best-oil-for-duramax/ and compare it with your car, so as not to complain about bad speed and so on. I have so far gone this way, because there are no problems with it, I am absolutely satisfied with the ride.