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Light white smoke on cold start is normal water vapour. Persistent thick white smoke means coolant is entering the combustion chamber — usually a head-gasket issue.
In our network we see these in roughly this order. Diagnostic comes first — never authorise a repair without a written diagnostic report.
Thin white smoke for 30-60 seconds, then clears. Just water vapour — no action needed.
Thick sweet-smelling white smoke that doesn't clear. Coolant + engine oil mix. Head-gasket repair: ₹35,000-1,80,000.
Like head gasket but worse — head replacement may be required. Fortunately rare on modern engines.
Coolant from oil cooler leaking into oil. Diagnosis: oil-cap milky residue.
Brief water vapour at cold start: yes. If white smoke persists more than 1 minute, it's not just condensation — get diagnosed.
Symptoms cluster: white smoke, sweet smell, coolant loss, milky oil-cap residue, overheating. A combustion-leak test (₹500) at any workshop confirms.
No — but a small weep can sometimes be sealed with chemical sealants (e.g., K-Seal) for a year or so. It's a stopgap, not a fix.
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