Skip the auto shop - Our mechanics make house calls

Q: Conventional oil vs. synthetic oil?

asked by on

I have a 99 silverado 1500 4.8l with 85000 miles, can I switch or is it safe to switch to synthetic oil at this point?

Hello. It is safe to switch over to synthetic oil if that is what you wish to do. It is just not a good idea to switch back and forth from synthetic to conventional oil as this can cause leaks and other problems with your oil pressure. If you want to use full synthetic oil you must use full synthetic oil for the remainder of the vehicle’s life or at least for as long of a time as you used the conventional oil. It is also not a good idea to switch to synthetic oil if you are currently leaking oil as this could accelerate the leak. If you’re having any oil leaks, I would recommend enlisting the assistance of a qualified professional to have the car repaired. A technician from YourMechanic can change your car’s oil at the convenience of your home or office.

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: How do I use the tow/haul mode?

If your vehicle has an automatic transmission, you will have the option to put your vehicle into Tow/Haul mode. This mode allows the transmission to reduce automatic shift cycling, which will give you extra control when driving down steep hills...

Q: No power on Start up, I jiggle the negative cable and it turns on. Now getting a reduced engine power message

Hi there. In most cases, the reduced power light and the battery terminal problem indicates two different issues. It's probably best to replace the battery and both cables to resolve the initial starting issue you've described. In regards to the...

Q: Stalls out when I put in drive p1729

Given your mileage, it is likely the throttle body and idle air controller need cleaning. It is also possible the throttle position sensor (which communicates with the transmission) may also be failing. This would seem more likely since your replacement...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.