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wingnut771 said:
Dont those engines give problems?
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Does not look good at all :( :rolleyes:

Short answer: yes — that 2.3L DISI turbo (MZR L3-VDT) absolutely has a reputation for issues, especially compared to typical Mazda reliability. But it’s not black-and-white — it depends heavily on maintenance, tuning, and how hard the car was driven.

Let me break it down properly so you understand what you’re getting into.

⚠️ The honest reality

The engine in the Mazda 3 MPS / Mazdaspeed 3 (both gens) is powerful but flawed. It was basically a high-boost turbo slapped onto a relatively standard block, and that came with consequences.

Some sources go as far as saying it’s “almost impossible to find one without prior major issues” — that’s extreme, but it tells you the reputation.

🔧 Common known issues (the big ones)
1. Cylinder 3 failure (the infamous one)
Loss of compression, especially in cylinder #3
Possible causes: poor cooling/oiling distribution, EGR/carbon, design quirks
This is the engine-killer issue you’ll hear about most

👉 If someone says “MPS engines blow” — this is usually why.

2. Turbo failure (very common)
K04 turbo is known to fail
Root cause is often oil starvation from a clogged feed line filter
Symptoms:
Smoke
Oil consumption
Sudden failure under boost

👉 This one is partly preventable with maintenance.

3. VVT actuator & timing chain issues
Cold start rattling = early warning sign
If ignored → timing chain stretch → catastrophic failure

👉 This is a known weak point across both gens, though later models improved slightly.

4. High oil consumption
Comes from:
Turbo wear
PCV system issues
Internal wear
Often tied to bigger failures later
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5. Carbon buildup (direct injection problem)
Intake valves get dirty over time
Leads to:
Power loss
Misfires
Very common on DISI engines
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6. General bottom-end wear
Rod bearings + cylinder liners can wear prematurely
Hard driving + poor maintenance = much worse outcomes
📊 1st gen vs 2nd gen — any better?
Gen 1 (BK, 2007–2009) → more raw, slightly more fragile
Gen 2 (BL, 2010–2013) → improved ECU tuning + small revisions

👉 But here’s the key point:
The core engine is the same. The fundamental weaknesses didn’t disappear.
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