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All the bottles in the cases say 02MAR09 on them.

I'll stick with the "Wife's" oil choice from now on. Seems she can pick a better and cheaper oil than me with all my "auto knowledge" !

I get 24.5 mpg currently with my driving. Best I ever got was 31 when I did a lot of driving to Tahoe on highway. The Mazda has a 5 speed automatic, so that probably doesn't help. I thought maybe it was running rich so pulled the spark plugs. They all looked the same, like these. This is at 60K...

Tig1, Yes this is the cartridge style filter. Kind of a PITA to change. I use purolator filters and they always look very clean.

Just an FYI my oil run was nearly all city miles, my trip computer showed average speed of 26mph. I do a 6 mile commute twice a day.

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.

I used to check if someone asked, but usually I found so many problems, all fluid low, leaks, etc. that I would spend a bunch of time making it right, because I can't leave something not fixed. Then I became the fixit guy for them. Unfortunately the worst maintenance offenders were women, who...

this is a funny thread. So my brother in law, 26 yr old grad student in electrical engineering, is going to school and needs a car. We buy him a Chevy Prizm. To this day he thinks it is a Toyota Corolla. Even though it says Prizm all over it. Also, the car burns oil and I tell him to check it...

Ok, one last try. flickr

That's weird. maybe this link works. flickr

Really? seems to work here. maybe it was a bitog prob.

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 should've put that in there. purolator oil filter from pepboys. This engine uses the cartridge design.

I'm continuing with Motorcraft 5w-20 but I've heard (probably from people that don't know anything) that going up to 5W-30 in the summer would provide more protection.

FZ1- About 6 months on the oil. 60% city driving.

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