As a seasoned automotive expert with years of experience in the industry, I've encountered numerous cases of car smoke issues that don't necessarily correlate with overheating. It's important to note that smoke from a car can be a symptom of various underlying problems, and it's crucial to diagnose the exact cause to address it properly.

Firstly, it's essential to understand that smoke is a visual indication of something burning or being vaporized. In the context of a car, this could be due to several reasons:


1. Oil Leakage: As you've mentioned, oil is a common culprit. If oil is spilled or leaks onto hot engine components, it can produce smoke. This can happen during an oil change if oil is accidentally spilled or if there's a leak from the valve cover gaskets or other seals.


2. Coolant Issues: Coolant, when it comes into contact with hot engine parts, can also produce steam, which may appear as smoke. This could be due to a coolant leak, which might not be directly related to the engine overheating but still needs attention.


3. Engine Cleaning Products: Sometimes, residues from engine cleaning products can be left behind in the engine bay. These residues can smoke when heated, especially if they haven't been properly cleaned off.


4. Transmission Fluid: Similar to oil, transmission fluid, if it leaks and comes into contact with hot surfaces, can also produce smoke. This is more likely to occur if there's a transmission issue that's causing fluid to leak.


5. Gasket Sealant Material: If a gasket sealant is used and not properly cured or if it's in contact with hot surfaces, it can also smoke.


6. Electrical Issues: Burning wires or electrical components can also produce smoke. This is a more serious issue that needs immediate attention.

7.
Exhaust System: Components of the exhaust system, such as the catalytic converter, can also produce smoke if they are overheating, although this is more likely to be associated with a noticeable temperature increase.

8.
Fuel System: A fuel leak that comes into contact with a hot engine surface can also result in smoke, and this is a potentially dangerous situation that requires immediate attention.

When diagnosing the issue, it's important to first observe the color and density of the smoke. Blue smoke often indicates oil burning, while white smoke could be steam from coolant or condensation. Black smoke might suggest a richer fuel mixture or a problem with the fuel system.

After identifying the type of smoke, the next step is to inspect the engine bay for visible leaks or burnt components. It's also important to check the vehicle's fluid levels and look for any signs of burning, such as scorch marks or unusual smells.

In conclusion, while a car smoking is not always a sign of overheating, it is a clear indication that something is amiss. It requires a thorough inspection and, in some cases, professional diagnosis to ensure the safety and performance of the vehicle.

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Gasket sealant material, engine cleaning products, coolant, oil, transmission fluid-- all of these things will smoke if they come into contact with hot engine parts. The most common cause is oil being accidentally spilled when filling. Valve cover gaskets also commonly leak and can cause smoking.read more >>