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The best oil?......this story takes me back decades ago when everybody had their favorite oil, as well as oils they would never use. We are going forward to the past with this oil debate and I love it! Rudy H is spot on with his M-M Act quote. Can't be compelled to use a specific oil brand. Use the proper oil weight recommended. Just look at new car service departments. They use factory or a name brand oil. And as pointed out, factory is just rebranded name brand oil. I have an '09 Toyota Corolla with almost 186,000. I use Mobil 1 synthetic 0w-20 and a Toyota oil filter. I change the oil by 5,000 miles since that is the factory recommended oil change interval. The engine uses about a pint of oil between changes.....the same as when new. So if your engine uses oil, don't immediately blame the oil. Mobil 1 has taken really good care of my engine. When I change my oil, looking into the filler hole in the valve cover, I can see a bit of the valve train. It looks as clean as it did when new. Absolutely amazing. Oil has come a long way over the decades.