Skip the auto shop - Our mechanics make house calls

Can You Switch Between Regular and Synthetic Motor Oil?

regular and synthetic motor oil

Although most of today's new cars, trucks and SUV's have synthetic motor oil inside their engines, there are still a few that utilize conventional motor oil as their primary source of lubrication. A commonly asked question here at YourMechanic.com is whether or not you can switch between regular and synthetic motor oil when you have your oil change completed.

The truth is - this is not a cut and dry, yes or no answer. In fact, depending on your individual application, The swap from conventional to synthetic or vice-versa may cause more harm than it's worth. In order to simplify the equation and to provide you with facts so you can make an informed decision, let's review some of the facts about synthetic and conventional oil sold in the United States today.

What is Synthetic Oil?

Synthetic oil is made from chemical compounds that contain some petroleum elements combined with highly refined crude oil, organic, and inorganic compounds. In addition to synthetic oils, there are also synthetic blends that combine synthetic oils with traditional petroleum-based oils.

Synthetic oils were developed to address a major problem all combustion engines deal with each time they are started: oil and solvents do not mix well together. Engine oil is designed to lubricate moving parts inside the engine, especially inside the combustion chamber. However, most fuels are petroleum based and are solvents, which literally wash away conventional oil which coats components.

Synthetic motor oil provides a protective layer of thin lubrication on metallic components so they maintain lubrication for longer periods of time. As such, most synthetic oils have distinct advantages over regular motor oil, including:

  • Better high and low viscosity performance
  • Decreased evaporation
  • Resistant to oxidation and sludge issues
  • Improved lubrication during extreme cold weather
  • Improved horsepower and torque
  • Increased fuel economy

Synthetic oil typically lasts longer than conventional motor oil, which can reduce overall costs or at least help justify the higher price tag that comes with synthetic oils. For example, a person might change his or her oil every 3,000 miles with regular oil and only every 5,000 miles with synthetic oil.

Switching to Synthetic Oil from Conventional

When synthetic oil was originally developed it was meant to be used only in engines engineered to be specifically compatible with it. Older synthetic oils used esters, which are chemical compounds mixed with alcohol, and were harder on the components, including engine seals and gaskets. The esters would cause wear and create oil leakage, and potentially overheating problems. Today’s synthetic oils use less alcohol compounds, and engine gaskets and seals are made to withstand synthetic oils.

In general, there are three primary benefits to switching from conventional to synthetic oil:

  • To reduce oil change intervals
  • To remove carbon deposits on moving internal engine components (like cylinder head valves)
  • To extend engine life

As you made the switch from conventional to synthetic, it is recommended to do this progressively. Here are a few tips to consider:

  • For the first oil and filter change, switch from conventional to conventional/synthetic blend. Continue with synthetic/conventional blend for at least two other oil changes.
  • Always replace the oil filter anytime you change engine oil.
  • On the third oil change, switch from the conventional/synthetic blend to full synthetic.

The one thing you do not want to change is the recommended oil weight or viscosity. If the above process is followed, it should be safe to switch from regular to synthetic or use a synthetic blend as long as you use the same weight of oil.

Concerns About Switching to Synthetic Oil

Most newer model vehicles will adapt to the change with no problem. However, older models with high mileage may not adjust to the change. Their seals are likely to be thinner and worn and you may find that they start burning oil as it seeps into the combustion chamber. It is important to consult your owner’s manual or ask a trusted technician before making the switch in a vehicle.

No matter what type of oil you use, regular maintenance with oil changes is essential to extending the life of your engine. Follow the guidelines by the manufacturer or ask the technician how often you should have your oil changed based on the make and model and how the vehicle is used.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...


Related questions

Q: Can I switch from Synthec oil back to conventional oil?

When you go to have your oil changed next time you can change to conventional oil without any problems. You can have a mobile mechanic like one from YourMechanic come to your location and the oil change for you. The...

Q: How often should I lubricate suspension? I have a 2012 Jeep Grand Cherokee.

The published maintenance schedule for your vehicle only lists an inspection recommendation for the front suspension and that would be every 6,000 miles. There is no reference to lubricating ball joints or tie rod ends, on the maintenance schedule, presumably...

Q: Does oil pan out of a Crown Vic with the engine in the car? 2001 Ford Crown Vic

Hello - yes, removing the oil pan with the engine in the car requires you to raise the engine slightly (disconnect motor mounts and drop the exhaust pipes), and it's a bit tedious, but it can be done. Check this...