I have read many threads and recommended tons of people to the site for years. This is my first post. I own 2 Mustangs. The 3.8L V6 has 300,000 miles on it. The 4.6 Cobra has 73,000 miles on it. I have only used 5W-30 Mobil1 ES oil in my vehicles. Last oil change I decided to put Mobil1 High Milage in the V6. My question: My first oil change with the Cobra is coming up, (previous owner only used Motorcraft semi-synthetic)and I planned on using Mobil1 High Mileage.
-Go with Mobil1 HM or Mobil1 ES??
-Go with Mobil1 HM or Mobil1 ES??