I choose to run Rotella T6 and after a couple thousand of miles I swap it out for Motul X-cess 5w40. It breaks down very easily and after 400 miles it shares the same viscosity as water, and this is no good for your engine. ![]() The factory oil shouldn't be kept in the car for longer than 400-500 miles. Again, this change is from my personal experience with the Mustang. With the spark plugs swapped it was time to get the oil out of the car. 028" which has worked out well for me in the Mustang on all fuels. I choose to upgrade to NGK "6510" LTR7IX-11's gapped at. Luckily the factory plugs in the Fiesta were in good shape and pretty consistent at. I made a thread over on which you can check out here that has some good technical info regarding the plugs. The gaps alone made for odd ignition corrections from the ECU and the ceramic being cracked could of potentially caused engine failure if it wasn't caught. The gaps were inconsistent and the ceramic was stress cracked after just a few miles. ![]() The reason for checking the plugs is because of my experience with the stock spark plugs in the Ecoboost Mustang. With a 1.6L turbocharged powerplant, aggressive styling, Cobb support, and a "cult" following, the choice was easy. The order was placed with Inver Grove Ford, and the car was in our hands 2 days later.įirst step was to inspect the stock spark plugs, drain the factory Ford oil, and get a good overall look at what we were working with. With the amount of success we have had with our 2015 Ford Mustang Ecoboost product line, we knew that sticking to the Ford Ecoboost platform was a must when we decided to pick up another vehicle for R&D.
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