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What could be the reason for an oil leak in the turbo of a Mazda CX7?
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Mazda's CX7 series engines have gained a reputation for issues with variable valve timing (VVT) that can lead to oil leaks, excessive smoke from the exhaust, loose timing chains, and even engine failure. While Mazda has addressed the VVT problems through a special service program, some owners have reported being denied warranty coverage. The main culprit behind VVT solenoid failures is typically old oil that has thickened over time due to engine heat and impurities, eventually becoming sludgy if not changed regularly.
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The Mazda CX7 might experience oil leakage as a result of a faulty turbocharger, a component that is frequently replaced in particular model years of this car.
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