Skip the auto shop - Our mechanics make house calls

Q: I had an oil change and Castrol GTX was used, which I assume is not a synthetic oil. Will that harm my engine.

asked by on

will regular engine oil used for an oil change harm the Subaru 2013 legacy 2.5 which has before this always had synthetic oil

My car has 25000 miles.
My car has an automatic transmission.

A: Synthetic vs conventional oil is one of the...

Synthetic vs conventional oil is one of the most debated myths surrounding the topic of oil changes. This will not hurt your engine when switching from synthetic to conventional or vice versa. In fact, Synthetic blend oils are actually a mix of conventional oils and synthetic oils. It is recommended that you use the same oil to top off when needed, giving you the best protection from the oil you have chosen to use in your vehicle. Many people often wonder about the benefits of using synthetic oils.

Many synthetic oils are made up of a base oil of approximately 80%, with other additives making up the remaining 20%. The main difference between the molecules in synthetically engineered oils are the uniformity of the molecules, while the molecules found in most conventional oils differ in shape, size and impurity. The type of oil that should be used for a specific application depends largely on the driver’s driving habits, the environment in which the car is driven, the mileage on the car’s engine and the limits that the engine may be pushed to. I would recommend having an expert from YourMechanic come to your home to perform an oil change service on your car to determine the best option for your vehicle in the future.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Water pump blew, found there was no oil despite having it changed a month ago. Can no oil cause a water pump to blow?

The oil works hand in hand with the cooling system to keep the engine cool. If the engine has no oil, there will be more friction inside the engine. This will cause moving parts to wear very quickly and then...

Q: I've changed my water pump, thermostat, thermostat housing, fan clutch, radiator and my ram is still overheating to about 250 degr

You need to have the cooling system checked to see if there is combustion gases getting in the cooling system, causing it to get hotter than it should. Since you have overheating problems you may have a blown head gasket...

Q: My car has a high pitch chirping sound when accelerating. 2010 Subaru Impreza

Hi - your Impreza has a turbocharged engine for enhanced performance. This produces pressurized air for the engine, increasing power. To avoid over-pressurizing the engine, there are boost pressure controls, and a "waste gate" port to vent over-pressure - all...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...