"I have a crack in my engine block and it's not part of the extended Honda 10 year warranty — 2008 Civic owner, r/Honda"
RISKY
52/ 100
"Cracked block defect haunts every example"
212
Max HP
315
Torque Nm
7,500
Oil interval km
0
Recalls
2
Known issues
Known Issues
Engine Block Cracking at Coolant Passage€1,500-4,000 · 60,000-120,000 kmCRITICAL
A well-documented manufacturing defect in the R18A block causes cracking near the coolant intake passage, leading to external coolant loss and overheating. Honda issued a TSB (08-044) and later a revised block casting with thicker walls to address the problem. 2006–2009 model years are most affected; post-2009 cars received the revised casting but some early 2009 units may still be vulnerable. Honda extended warranty coverage for some markets but many owners fall outside eligibility.
Coolant puddle under engine with no visible hose leak
Unexplained coolant level drop
Engine overheating
Sweet smell of coolant from engine bay
Failed coolant pressure test with no obvious external source
DIY: Hard — requires engine removal for proper repair or replacement
Hydraulic Engine Mount Failure€150-400 · 80,000-150,000 kmMODERATE
The upper hydraulic engine mount is known to fail, losing its oil fill and becoming a solid rubber mount. This results in increased vibration transmitted to the cabin, particularly at idle and low RPM. The mount splits at the top, which can allow oil to leak out prematurely.
Increased cabin vibration at idle
Clunking noise when engaging or releasing throttle
Visible oil residue on or around the engine mount
DIY: Moderate — accessible with basic tools but requires proper support of the engine
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Buying Checklist
Perform a cold coolant pressure test and hold at 1.0 bar for 10+ minutes — any drop indicates a cracked block or leak
Inspect the engine block surface around the coolant inlet casting for hairline cracks, white residue, or discolouration
Request full service history and confirm whether the engine block has been replaced or is a revised post-TSB casting
Check coolant reservoir for oil contamination (milky appearance) and oil filler cap for white mayo deposits
Rock the engine by hand in park and check upper engine mount for excessive movement, cracking, or oil seepage
Verify the car's model year build date — 2006–early 2009 cars carry the highest block failure risk; prefer late-2009–2011 examples
Service Reality
Community oil interval7,500 km
Oil specificationHonda recommended 0W-20 or 5W-20 full synthetic; community commonly uses 5W-30 full synthetic in higher-mileage examples
Est. ownership cost (2yr)€600-1,200/year on a clean example; €3,000-5,000 one-time if block failure occurs on an unresolved early unit
The R18A Civic Mk8 is a practical, affordable commuter let down by a serious and well-documented engine block cracking defect that has destroyed many otherwise healthy examples. If buying, strictly prioritise 2009.5–2011 build dates with the revised block casting, and always conduct a cold pressure test before handing over any money. Any car that cannot prove engine replacement or confirmed revised casting should be priced accordingly — factor in up to €2,500–4,000 for a block replacement if the test fails. Well-maintained survivors with the revised block can still offer solid long-term ownership, but the risk on earlier cars is too high to ignore.
Parts People Buy
Honda R18A Replacement Engine Block / Long Block AssemblyLink unavailable
Honda Civic Mk8 Upper Engine Mount HydraulicLink unavailable
Coolant Pressure Test KitLink unavailable
Honda OEM Coolant Blue Type 2Link unavailable
Full Synthetic Engine Oil 0W-20 for Honda R18ALink unavailable
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