Reviewed By Randall S (CHANTILLY, VA) Reviewed for a 2008 GMC Yukon XL —12/23/2017 6:13 AM
Excellent device, highly recommended. Works as expected and keeps the vehicle in V8 mode. It really doesn't seem to impact fuel mileage. Note that you are supposed to remove the unit if you don't drive your vehicle daily since it will slowly drain the battery. GM has an issue with these engines running in V4 mode so this is a handy device to have. I replaced the driver's side valve cover as indicated in GM's technical service bulletin for the engine. I don't have an oil burning issue yet.