What are oil cooler lines?
Oil cooler lines are two solid metal tubes or reinforced rubber hoses that run your car’s pressurized oil to the oil cooler before sending it to the engine.
The oil cooler works like your car’s radiator—it uses air to remove excess heat before sending the oil back into the engine. The oil cooler is an important detour for some engines, and the oil cooler lines are a vital part of that process.
How do I know if my oil cooler lines need replacing?
Oil cooler lines do not have a set lifespan, so if your engine is running right, you will never have to replace them. But most drivers don’t realize just how important these lines are—and how important keeping engine oil cool is.
The hotter the oil gets, the thinner it becomes and the less it protects the engine. In order to pump the oil into the cooler, the oil cooler lines must be working properly. Because these lines undergo a lot of wear over the vehicle’s lifetime, there are some warning signs and common symptoms to look out for if your cooler lines need replacing:
Crimps or bends in the oil cooler hose
Oil leaks and puddles under your car
Physical damage to the lines
Leaky oil cooler lines can cause your vehicle’s oil levels to drop, harming your engine in the short and long run.
Pro tip: If the lines themselves look okay, but you notice there’s still some leakage, check the fittings as well. Some oil cooler lines and fittings are connected to the fittings as one piece, but sometimes they are two separate parts.
How often should oil cooler lines be replaced?
As with many parts in a vehicle’s engine, the oil cooler lines don’t have a set replacement interval—they generally don’t need to be changed unless there’s a problem.
If your car has oil cooler lines and they need replacing, there are a couple of things to consider:
Consider replacing both the oil cooler lines and the fittings. Some lines are connected to the fittings, so it will be necessary to replace both.
If the lines lead to an oil cooler, you may need to replace the oil cooler as well, especially if the damage results from debris buildup.
Simply put, when you need to change your oil cooler lines depends on your vehicle and how often you drive. To keep everything in optimal condition, have your lines inspected whenever you perform an oil change and regular car maintenance
. Can I replace my oil cooler lines myself?
If you're not car-savvy, replacing the engine oil cooler lines yourself could prove a difficult DIY job—there's a lot of elbow grease involved. If unsure, it's always best to leave it to the professionals and bring your car to a mechanic for help.
However, if your car is still under warranty—or if you’ve purchased an extended warranty—your transmission cooling system may be covered under your warranty. Contact your local dealership for details.