Can You Add Oil to a Hot Engine & How Long Will It Take to Cool Off
There is nothing more frustrating than a check engine light flashing for miles as you drive to work or drop the kids off at school. Many times, that light is just a simple indicator that you need to add some oil. However, many fear adding motor oil to a hot engine is a bad idea, but they are wrong.
You can add oil to an engine that is still hot, but you want to make sure you always use the best oils and add the right amount to keep your vehicle running properly.
Can You Add Oil to A Hot Engine
There are a lot of misconceptions flying around about whether or not you can add oil to an engine while it is still hot.
Many people seem to believe that adding cool oil into a hot engine can cause damage to the vehicle, but this isn’t true at all. The metal in the engine is too thick and durable for this to happen, and there is no way that oil is going to cool it down at a rapid speed.
However, you still want to wait a bit before adding any new oil into the oil tank or at least a few minutes because you want the oil to settle before checking the level.
Reasons to Wait For the Hot Engine To Cool
Although there is no need to worry about damaging your engine by adding oil to it while it is still hot, there are other reasons you may want to give it some time to cool down.
Besides allowing the oil to settle for a few minutes after rushing through the engine, you might also want to let it cool down so you can get an accurate reading on the dip stick. Hot oil is known to splashback at the dipstick, giving off inaccurate readings.
Another more obvious reason for waiting for your engine to cool down before topping off your car’s oil is safety. A hot engine can cause the rest of the metal parts under the hood to be extremely hot, too. Hot metal can be dangerous and very painful if it touches your bare skin.
Why is the Engine Oil Level Important
You should never add extra oil into your tank unless you know it needs to be topped off. If you add too much oil, you can damage your engine.
- Overfilling the oil will add more pressure to the system, causing it to filter through faster than it should and not do its job as intended.
- You could also destroy your gaskets if your oil levels are too high and they end up leaking out into areas of the vehicle they shouldn’t. Replacing gaskets can be time-consuming and pricey.
- When the oil runs through the engine, too much can cause it to foam up, making it less effective and unable to reduce the engine temperature appropriately.
When Should You Add Oil to an Engine
Most vehicles these days will let you know when your oil level is getting low, and you will get a reminder that you need to top off when the oil pressure drops. However, many people will end up adding some oil to their cars before it’s time for an oil change.
To determine if your oil needs a top-off, you can check the level with the dipstick, just to be sure it is where it needs to be. If the level is under the indented line on the stick, your vehicle needs a little oil added.
How Long Will it Take an Engine To Cool Off
Even if you don’t have time to cool your engine before topping it off with extra oil, you must allow it to cool down completely if you plan on draining and changing your oil.
It will take your vehicle about 30 minutes to cool your engine oil down to a safe temperature. You don’t want to go to it at all before then.
Can You Add Oil to A Cold Engine?
Just like with a hot engine, the temperature is not going to affect your vehicle in any way. You can add oil to a cold engine, although you will want to start it and let it run for at least a couple of minutes to make sure the oil level is reading at actual levels.
Can You Add Oil to A Running Engine?
Although it may be more convenient to run into a store, grab a bottle of oil, and top off the tank to stop the darn light from flashing at you, it isn’t a good idea.
When your vehicle is running, the oil is moving at a high rate of speed. Opening the cap to the oil is going to cause it to come flying out of the opening.
Our Final Opinion
You must always keep your oil at the proper levels and run it through a clean filter. Those two things are important for the maintenance and care of your vehicle. The temperature of your engine when you top off your oil does not matter, and adding oil to a hot engine will not damage it in any way.