Search results

Ran this oil as my wife got this on sale (without my knowledge) at costco. I usually run Motorcraft semisyn 5W-20 with good results but heard good things about the Formula Shell so decided to try it out instead of returning it. Although it is thicker my gas mileage stayed the same.

My mazda3 2.3litre 5spd auto uses the Motorcraft 5w-20 semi synthetic I get at walmart. I had good results in the past. I wanted to go longer but my TBN seemed to drop a lot in just 1575 miles. It went from 4.2 to 1.4. I've been doing lots of city driving since the last report. Does anyone think...

I just found this forum and I'm no expert on the subject but this is what I got back after 4000 miles on Motorcraft 5w20 in my wifes 2.3L Mazda3. I've used Motorcraft 5w-20 since after the factory fill. No top of oil ever needed. Any areas of concern here or pretty normal? thanks, Paul