I have 3000 miles currently on the Amsoil 5w30 and SDF filter. The car has been on crude (the dealer brand)since new, and OCI every 3.75k mi, the mileage now is 56600. I used the Amsoil Engine Flush on the first application. I was wondering can I use the Auto-Rx to finish off the current Amsoil, and what affect will this mixture have? I want to run a second Amsoil perhaps the series 2K 0W-30. So far there has been no oil leaks that I can see. I read the Auto-Rx website and it suggest using regular oil. Any and all info., will help. Btw, I experienced heavy smoke within the first 1000 miles, since than no problems since any idea what that might have been??