when i first got my black beast, my uncle and i checked thru out the car and found the fluids were dirty, oil wasn't changed like the previous owner said he'd done a service, but was a load of bullocks. after that using engine flush once i changed religiously every 5k for 20k, then extended it to 7k and then 10k. make sure u change the filter too. i use baldwin (B37) filter cleaned the throttle body, replaced the fuel filter, the air filter/pod. THEN i reset the ECU. car runs much stronger now over time. just need abit more TLC as long as the previous owner didnt rape it.