Mobil 1, now in 5w - 30
Discussion
In my local Esso petrol station I saw 5w-30 on sale today alongside the 0w-40. I hadn't seen this before. The 5w-30 was only in 1 litre containers and priced at £13.99 
compared with the 0w-40 at £12.99. They call it "ESP" standing for Environmental System Protection and the write-up confirms it's not radically different from 0w-40; just a bit more fuel economy etc.
I recently bought some 0w-40 from OpieOils (excellent service at £68 for 8 litres delivered) and didn't see any 5w-30 on their product list.
"Product Description. Mobil 1 ESP Formula 5W-30 is an advanced performance synthetic engine oil designed to provide exceptional cleaning power, wear protection and overall performance. Mobil 1 ESP Formula 5W-30 has been expertly engineered to help prolong the life and maintain the efficiency of Car Emission Reduction Systems in both diesel and gasoline powered automobiles. Mobil 1 ESP Formula 5W-30 exceeds the requirements of many leading industry and car manufacturers' standards required for newer modern diesel and gasoline powered passenger car engines.
"Features and Benefits. Mobil 1 ESP Formula 5W-30 is made with a proprietary blend of leading edge components formulated to be fully compatible with the latest Diesel Particulate Filters (DPF's) and Gasoline Catalytic Converters (CAT's). Mobil 1 ESP Formula 5W-30 has been designed to deliver outstanding performance and protection in conjunction with improved fuel economy."
More at www.mobil.com/UK-English/Lubes/PDS/GLXXENPVLMOMobil_1_ESP_Formula_5W-30.asp
compared with the 0w-40 at £12.99. They call it "ESP" standing for Environmental System Protection and the write-up confirms it's not radically different from 0w-40; just a bit more fuel economy etc. I recently bought some 0w-40 from OpieOils (excellent service at £68 for 8 litres delivered) and didn't see any 5w-30 on their product list.
"Product Description. Mobil 1 ESP Formula 5W-30 is an advanced performance synthetic engine oil designed to provide exceptional cleaning power, wear protection and overall performance. Mobil 1 ESP Formula 5W-30 has been expertly engineered to help prolong the life and maintain the efficiency of Car Emission Reduction Systems in both diesel and gasoline powered automobiles. Mobil 1 ESP Formula 5W-30 exceeds the requirements of many leading industry and car manufacturers' standards required for newer modern diesel and gasoline powered passenger car engines.
"Features and Benefits. Mobil 1 ESP Formula 5W-30 is made with a proprietary blend of leading edge components formulated to be fully compatible with the latest Diesel Particulate Filters (DPF's) and Gasoline Catalytic Converters (CAT's). Mobil 1 ESP Formula 5W-30 has been designed to deliver outstanding performance and protection in conjunction with improved fuel economy."
More at www.mobil.com/UK-English/Lubes/PDS/GLXXENPVLMOMobil_1_ESP_Formula_5W-30.asp
More and more car manufacturers are specifying this grade oil as standard although it's benefits seem to be aimed at economy. I never really got a decent answer from anyone about why using the stock 0w Mobil 1was a bad idea. The Mustang is supposed to use 5w-20 but you can't get that for love nor money.
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