Have you noticed an oil leak? Has your car's gas mileage declined? Have you seen smoke when you start the engine or after driving for a while? If any of these are answers to your "yes" question, then it sounds like your car is losing oil. The good news is that there's no need to panic because there is no leak, and a car with this issue doesn't emit any particular smell.

What is a Leak?

If why is my car losing oil but no leak it might be due to a cracked engine block. A cracked engine block can cause oil to seep out of the engine and into the surrounding area. This oil seepage can be difficult to detect because it happens slowly and there is no visible leak. However, you might notice that your car is low on oil or that the oil level drops quickly after being topped off. If you suspect that your car has a cracked engine block, take it to a mechanic for diagnosis and repair.

Signs of Oil Leaks

If your car is leaking oil but there's no smell and no sign of a leak, it could be due to a few different things. First, check the oil level on the dipstick. If it's low, then you may have a slow leak. Another possibility is that the oil is burning off due to an internal engine problem. Finally, if there's no oil on the dipstick at all, then you probably have a large leak somewhere.

How to Fix an Oil Leak

If your car is leaking oil but there's no smell and no leak, it's probably due to a bad seal or gasket. There are a few things you can do to fix this problem.

First, try tightening the oil cap. If that doesn't work, then you'll need to replace the oil pan gasket. This is a relatively easy repair that you can do yourself. Just make sure you have the right tools and parts before starting the job.

If your car is still leaking oil after replacing the oil pan gasket, then it's likely that the engine block itself is cracked. This is a much more serious issue that will require professional help.

Car Losing Oil But No Smell

If your car is losing oil but there's no leak and no smell, it might be due to a faulty oil Pressure Relief Valve (PRV). A PRV is responsible for maintaining the pressure in the oil system, and if it's not working properly, oil can leak out.

If you think your car's PRV might be faulty, take it to a mechanic to have it checked out. In the meantime, keep an eye on your oil level and top up if necessary.


If you've noticed that your car is losing oil but there's no leak or smell, it could be due to a number of different factors. The most likely culprit is a faulty piston ring, but it could also be due to improper oil weight or viscosity, an overfilled oil pan, or even a bad PCV valve. No matter the cause, it's important to get the problem fixed as soon as possible to avoid further damage to your engine.