I have used Mobil 1 Synthetic for years, and I recently used Mobil 1 Extended Performance. I honestly don't have any complaints about Mobile 1 EP. I have a 2007 Honda Accord 4 cylinder with 130,000+ miles. I have used Mobil 1 Synthetic 5w-20 for the first 125,000 miles, and then I used MB1 EP 5w-20 for one oil change between 125,000 and 130,000 miles. I honestly can't tell a difference between the two. However, at the 130,000 mark, I switched to Pennzoil Ultra in 5w-30 and I can honestly notice a difference for the better. With the Pennzoil Ultra, my engine is quieter and smoother. I can't tell you specifically if the reason that my engine is running better is because of the Pennzoil Ultra, or because I switched from 5w-20 to 5w-30, or perhaps both. All I can tell you is that I used to be a loyal Mobil 1 fan for over 20 years, and I have now switched to Pennzoil Ultra. I am going to use it in my 09 Toyota Rav4 Limited with 4 cylinder next, and will give an update at that time.
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