My Peugeot 405 won't start this morning, and I don't have a clue why the engine suddenly won't crank. What are the possible issues here? What could be wrong with the engine?

If the engine won't start, you should check the car battery. It may have lost charge or it's already failing. Another possible reason for this is a defective ignition wire or car ignition switch. If the battery is okay and the charging system seems fine, then check the rest of the ignition system. If you still can't find the source of the problem, have this issue diagnosed by a professional. With a complete set of tools, some tests can be done and thorough inspection can be carried out to find the best solution.

I just had the motor oil of my Peugeot changed recently. Unfortunately, there's this burning smell that makes me worry. This can be smelled inside the cabin sometimes. I searched for a trace of leak, looking underneath the vehicle for a puddle of fluid, but I can't find any drip. I even monitored the oil level. What seems to be the problem here? I don't have any clue. Help!

In this scenario, it's possible that when the oil was changed, some of it dripped into the exhaust manifold or the engine block. As the engine gets hot, the oil burns. This can explain why you can smell the burning odor. To fix this problem, what you should do is check somewhere around the oil fill cap to see if there's any spill. If there's none, you may consider another possibility. When the oil filter was replaced, the gasket of the filter unfortunately got stuck to the engine block. With the new filter installed, the stacked gaskets could have caused the oil leak. The fluid may be leaking onto the exhaust. To confirm this, check the oil filter for any sign or trace of leak. Also make sure that the oil plug is sealed tight.

Is antifreeze and engine coolant the same thing? We were having an argument over this. My friend said that there's a difference.

Although most people consider antifreeze and engine coolant to be the same thing, your friend is right in saying that there's a difference. The engine coolant is the result of the antifreeze and water mixture. Antifreeze is added to water, usually in a 50-50 ratio, to protect the engine against freezing and boil over.

I was a bit preoccupied when I was trying to refill the reservoir with windshield wiper fluid. I then accidentally added this fluid into the radiator overflow reservoir. I have already cranked the engine when I realized this. I then turned off the vehicle. I don't know what to do about it. Any advice or suggestion?

For the fluid mix-up, what you should is have the coolant flushed. Flushing is needed, not just draining. After this has been done, you can refill the system radiator overflow reservoir with engine coolant, which is typically a mixture of 50% water and 50% antifreeze. The old antifreeze should be recycled. Until this issue has been resolved, refrain from driving the vehicle.

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