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Interesting point about the cats. For the last 3,000 miles I have had to reset the CEL for a P0431 code: Warm Up Catalyst Efficiency Below Threshold (Bank 2). I was quoted $900 by an independent shop for replacing the suspect catalytic converter, which is located in the exhaust manifold, so I...

The oil level was down almost a quart. Except for a front main seal leaking at 90,000 miles this has been a great engine. I have read that many of these V6 Duratecs die prematurely due to a fragile cooling system component (a plastic multiple-tee junction point for many cooling hoses). I hope...

I wanted to see if I could do annual oil changes on this vehicle, at 12,000 miles, but I am more comfortable at 10k with the Mobil 1 EP.

Not the recommended viscosity for this vehicle (manual says 5W-20) but for a people-hauler in the Phoenix climate I think this oil works well.

Mazda also sells just the ball joint boots, at least for the Mazda 6: GJ6A34541A for the front lower control arm ball joint GJ6A34551A for the rear lower control arm ball joint The lower ball joints are not replaceable so if they're shot, Mazda will sell you the entire control arm assembly...

Originally Posted By: Vizzy If you have a decently maintained late model car there is nothing good that comes out of using such a snake oil in your fuel. I disagree. If I notice the use of MMO resulting in an improvement of any aspect of my vehicle's operation, I feel justified in using it and...

My commute is just two kilometers so I compensate in a few ways. First, I let my engine run until the catalytic converter air pumps stops (one minute) before I drive off. Second, I use Shell Rotella T6, 5W-40 which has a high TBN and higher than recommended viscosity to combat the fuel dilution...

Both my wife and her sister use MMO at the rate of 8 oz per 12 gallons of 87 octane. Both ladies swear it gives them more power. My wife drives a 2004 MPV and her sister drives a 2006 Mazda6s and they have similar engines, the 3-liter Duratec. I drive an RX-8 and I use from 1/2 to 1 oz per...

Today I filled up with Shell Premium (91 octane) for $2.62/gallon in Irvine, CA. I stick with either Shell, Chevron, Mobil or Texaco because these fuels work best with my RX-8, unlike the unknown quality gasoline from Sam's or Costco which sometimes feels as if I bought stale fuel. Even my MPV...

OK, I'll cut back to the recommended dosage on my Mazda 6s, especially since I haven't seen any benefit of going the OD route. On the other, albeit very differently designed hand, my RX-8 does seem to benefit from a 1 oz per gallon mix. This car earned EPA estimates of 18 mpg city and 25 mpg...

Since around 50,000 miles (I'm now at 60,000) I've added 12 oz of MMO during each fillup of my Mazda 6s. With 15 to 16 gallon fillups, that's a bit less than 1 oz per gallon. I haven't noticed any difference at all yet, and I don't really expect any since the car has run perfectly since new. I...

I agree that the OP's Renesis was done-in by a lack of lubrication and I think it was caused by too low viscosity combined with high oil temp. The first modification I made to my 2007 Automatic RX-8 was to add an engine oil temp gauge. During my first summer while commuting in the Phoenix...

In my 2007 RX-8 I use 8 oz per 12 fillup and have been averaging 25 mpg in my daily commute of 40% suburbs/60% highway. Pretty good for a car EPA-rated at 16/23 mpg! I mainly use MMO to keep the intake & exhaust ports clear of carbon and soot but I'll gladly also take a payback in improved fuel...

I also have a 2007 RX-8 with about 5000 miles and I am using Mobil 1 15W-50. A VOA is at this link: http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1041220#Post1041220 I chose this heavyweight for a few reasons: 1) my location has high ambient temps, Phoenix, AZ; 2) a...