The Truth About Cars » CX-7 The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. Thu, 24 Jul 2014 14:26:12 +0000 en-US hourly 1 The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. The Truth About Cars no The Truth About Cars (The Truth About Cars) 2006-2009 The Truth About Cars The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. The Truth About Cars » CX-7 Piston Slap: Inject Fuel Directly into…Oil? Mon, 29 Jul 2013 12:49:21 +0000 lead9-2011-mazda-cx-7-review

Evan writes:


I have a piston slap question for a friend at work. She drives an ’11 Mazda CX-7 2.3. For over a year she has had an issue with fuel in the oil. Enough that the oil level has been as much as 1″ above the full mark on the dipstick as a result (oil level was checked after service, and frequently between services). This is noticed within weeks of service/oil change.

The issue seems to be worse with more short trips, and the car has been serviced as recommended by Mazda (or more frequent oil changes when warranty fixes attempted). The dealer has had the car repeatedly over the last year, and now continuously for over 2 months. They have replaced the HPFP 6 times as well as replacing the injectors twice. Leakdown and compression tests show no issues. Canada has no lemon law (just horrible binding arbitration), or the car would probably be a buyback by now.

The dealer has spent over 13k in repairs trying to fix it. They are at a loss, and Mazda forums haven’t helped, so I come to you and the B&B hat in hand. Also, even if they can fix it how much damage will so much fuel dilution cause? Should they demand and reasonably expect some sort of engine warranty extension?

Sajeev answers:

I am totally bummed to hear about your lack of Lemon Law-ing ability in this case.  O, Canada! 

I would seek more information on arbitration and contact Mazda Canada formally (AND via Social Media) to see if they’ll do anything. Sell this Mazda after the (possible extended engine) warranty expires…unless you’re thinking what I am thinking.  Ya know, an LS4 swap.

Mmm, LS4-FTW…that would be so awesome.

(cue harp strings, dream sequence) 


OH YEAH!  Front wheel drive…with BALLS!  Zoom-ZOOM-Zoom!

Ahem, now where were we?

Finding conclusive information on why fuel-oil dilution exists is tough via Google, but this SAE paper might contain the truth. Too bad I’m too cheap to buy it, too lazy to read and summarize for everyone’s benefit. Maybe some engineers with active SAE memberships can chime in here?

What say you, Best and Brightest?  Time to get a lawyer?


Send your queries to Spare no details and ask for a speedy resolution if you’re in a hurry…but be realistic, and use your make/model specific forums instead of TTAC for more timely advice.

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Review: 2011 Mazda CX-7 iSport Mon, 27 Dec 2010 20:05:40 +0000

With the 2007 model year introduction of the CX-7, Mazda arrived late to the compact crossover party. And when you arrive late, you’d better bring something special. To this end, the CX-7 combined swoopy styling and a standard turbocharged engine, making it arguably the sportiest offering in the segment. After an initial burst, during which everyone who really wanted one bought one, sales have been modest. In a bid to broaden the CX-7s appeal, Mazda added a non-turbocharged four as part of a 2010 refresh. But if you take away one of the few things that made the CX-7 special, is there any reason to buy one?

The CX-7’s styling remains much the same after last year’s refresh. The crossover’s nose is a little more blunt than earlier, with a new band of chrome along the upper edge of the lower grille to take it a quarter-notch upscale. But the fender bulges, steeply raked windshield, and basically ovoid shape remain the same. People who liked the look of the CX-7 before will still like it. And those who didn’t still won’t. The i Sport’s 215/70HR17 tires appear lost within wheel openings sized for low-profile 19s, and do the CX-7 no aesthetic favors. Low profile tires have become so common, it’s almost hard to believe 70s are still around.

Why such unsporting tires on the i Sport? Well, within Mazda’s current naming scheme, which rivals BMW’s in its capacity to confound, “Sport” means one step up from the SV, with the latter much more prevalent in dealer ads than on dealer lots. So “Sport” essentially means “base.”

Inside, the CX-7’s styling has been refined, with minor tweaks to the trim, but you’ll probably have to compare before and after photographs to spot the differences. For example: the bands of chrome that outline the sides of the center stack no longer connect at the bottom to form a U, and have been joined by additional bands of trim in gunmetal blue. This interior remains more attractive and interesting to look at than the segment norm, but with all manufacturers focusing more and more on design the gap has been closing.

The largest change: the dash now humps up a bit over the top of the center stack to open up space for a pair of small, four-inch LCD screens. One of these houses the optional rearview camera display and, in the Grand Touring, the navigation display. Compared to the 2007-2009’s seven-inch display it’s much smaller, especially when you factor in that it’s also farther away, but located closer to the driver’s sightlines. And no doubt cheaper, though how expensive is a seven-inch LCD these days? The original display in the new location would be much better than either thus far offered alternative.

The large, steeply raked windshield and the windowlettes that flank it make for a driving position that’s more minivan than SUV. The seats front and rear are firm and fairly comfortable. There’s more shoulder room than in other compact crossovers, such that the CX-7 feels almost mid-sized from the driver’s seat. But paradoxically there’s less legroom than in the average compact crossover. Still enough for the average adult, but the Honda CR-V and Toyota RAV4 surprise (and delight?) in this area. Cargo volume is similarly compromised by the ovoid shape yet still adequate.

Compared to the competition, the CX-7’s 2.5-liter four is down about twenty horsepower (161 at the 6,000 rpm peak), and it must accelerate about one hundred additional pounds (3,496). In practice, even with a five-speed automatic (the RAV4 benefits from an additional cog) acceleration is thoroughly adequate, if a bit buzzy at low rpm. Fuel economy is about 21 in typical suburban driving, though as high as 26 along one casual stretch. For those who desire more of a rush (at the expense of fuel economy) the 244-horsepower boosted four remains available, and mandatory with all-wheel-drive. Honda and Toyota offer all-wheel-drive with the normally-aspirated fours in the CR-V and RAV4. The 2.5 performs well enough in the CX-7 that I wonder why Mazda doesn’t do the same.

I was underwhelmed by the Mazda CX-7’s handling when I first drove it about four years ago. The exterior styling promised considerably more entertainment than the chassis could deliver. Adding tires with tall, ride-oriented sidewalls does not help. So equipped, and further saddled with slow steering, the CX-7 feels large and soft. Ride quality is generally good, though some roads unsettle the chassis. Overall, this is the rare Mazda that trails its competition in terms of driving enjoyment.

With the $1,750 Convenience Package (sunroof, rearview monitor, automatic climate control, power driver seat), the 2011 Mazda CX-7 i Sport lists for $25,340. A little pricey compared to a similarly equipped car—a Mazda3 s costs over $2,000 less while being more economical and orders of magnitude more fun to drive—but within a few hundred dollars of the CR-V and RAV4. Based on responses to TrueDelta’s Car Reliability Survey, the CX-7 got off to a rocky start back in 2007, but has since improved to average for both the 2007 and 2008 model years. (Much lower sales in recent model years have resulted in insufficient sample sizes.) Many of the earlier problems involved the turbocharged four. With the non-turbo 2.5-liter engine the CX-7 should be reliable.

For decades Mazda has struggled to survive, periodically aspiring to become a first-tier auto maker but each time falling short. Their successes have followed from emphasizing the fun-to-drive qualities of much of their cars. But the enthusiast market just isn’t large enough, especially not in the compact crossover segment. Problem is, remove the turbocharged four from the CX-7, and what little excitement the CX-7 offered along with it, and there’s no compelling reason to buy a CX-7 instead of a CR-V or RAV4 unless you really like how it looks. And if you care about how it looks, you’re going to want to replace those 17s.

Mazda provided the vehicle, insurance and one tank of gas for this review

Michael Karesh owns and operates TrueDelta, an online source of automotive reliability and pricing data.

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