Turbo failure + Engine blow-by 2010 CX-7 - Mazda Forum - Mazda Enthusiast Forums


Mazda CX-7 This sporty turbocharged 4 cylinder SUV combines the spirit of a performance car with the versatility of an SUV.

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Old 08-09-2018, 09:34 PM
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Default Turbo failure + Engine blow-by 2010 CX-7

Hey all--we have a 2010 CX-7. Our turbo went out about a year ago at 84,000 miles, and we got it replaced at the dealer. We brought it back to the dealer for an oil change about a week ago and oil was low. After a test, they are saying there is blow-by on several cylinders and will need a new engine.

I'm frustrated because we spent about $3k on the turbo, and wouldn't have had we know of the engine issues which seem like they had to have been happening at least somewhat when we got the turbo replaced less than a year ago. Hoping Mazda will help us out to me it seems crazy that a turbo and engine would go on a car with 92,XXX miles.

Looking for some iopinions. Is this common on this car; should the dealer have caught and told us about the engine issues at the time of the turbo replacement; do you all think there is any chance of either a refund on the turbo from the dealer or for mazda to replace the engine?
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Old 08-09-2018, 10:01 PM
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I haven't followed the history of the 2.3 liter Turbo MZR engine used in the CX-7, MazdaSpeed3, and MazdaSpeed6 all that closely, but from what I understand, turbo replacements are relatively common, but not as early as the one in your car. As a general rule of thumb, I equate early turbo failure with the use of non-Synthetic oil due to the bearing coking issues brought on by conventional oil. If that rule of thumb holds true for your car in that conventional oil used throughout its life then the relatively early engine failure isn't too surprising.

The above said, if your car has been lubricated with a full synthetic oil for its life, then I am very surprised at how early both the engine and turbo failed. Regardless, I rather doubt you're going to get much satisfaction from Mazda on an eight year old car with nearly 100,000 miles on it. Sorry to be the bearer of bad news.
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