Skip the auto shop - Our mechanics make house calls

Q: What's the difference between fully synthetic and semi synthetic oils

asked by on

Would like to know the difference and why I would choose one over the other? Thanks in advance

My car has 20000 miles.
My car has a manual transmission.

The type of oil that should be used is a very heavily debated topic that depends a lot on where you live (climate), driving style, and the car. Synthetic oils are engineered for very high stress performance/luxury vehicles that require the best lubrication under very harsh conditions. Semi-synthetic oils have a combination of synthetic oil and mineral based oil in them. If you are a normal everyday driver that does not drive in extreme conditions and typically drive in fairly normal weather climate, I would say you probably do not need to spend the extra money for a fully synthetic oil based upon the type of car you are driving currently. If you would like to have an oil change done for you, a certified technician can perform this service at your home or office using the correct oil.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • What's the difference between fully synthetic and semi synthetic oils

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: Car self-accelerates intermittently

Hello. The odor of oil is merely coincidental to the symptoms you report. Any vehicle of that vintage is going to have multiple oil leaks unless the engine has been re-sealed or re-built. Just be sure the leak is not...

Q: Why am I getting quotes for spark plug replacement for a 2008 Toyota Avalon of 495?

Spark plugs on your model do require relatively more labor time to replace, compared to other vehicles. That is why the quote you are getting seems high for a part that is so simple. However, your general supposition that the...

Q: Car took longer to start than usual

Hi there, thanks for writing in. Although your car is nearly brand new, it certainly isn't impossible for it to have a failed battery. If it cranked over slowly as it was starting, it could be an indication that the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.