Where does synthetic oil come from? Ask Alex #1

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In this new series I’ll be answering questions that I recieve on the comments, on twitter or by email. 

Today’s question is “Where does synthetic oil come from?” by Aaron via email.

Before I get down to the differences between conventional oil and synthetic oil, what kind of synthetic oils exist and where they come from, here’s the article that lead to the question from Aaron:

Synthetic Oil Change Interval​

Let’s dive right into the topic!


I’ve conducted some MASSIVE research to craft a list of the top synthetic motor oils in the market. 

Check it Now!

How to know the origin: The base oil

You’ve seen in on the oil aisles at wallmart, at your local petrol station or at any garage with loads of oil cans. Some say “Mineral Oil” or Conventional oil, some say “Semi-Synthetic” and others say “Full Synthetic” and this is a very important classification when it comes to the origin of each oil.

Let’s have a look at this chart from the American Petroleoum Institute:

josh graph oils

Any motor or transmission oil, has a base oil, commonly known as stock oil. 

So in order to know where any oil comes from, you need to know the base oil! Anything else is irrelevant.​

Base oil from from the groups I, II and III are mineral oils, which are refined straight from crude oil.

Therefore, they come from “Dyno Oil”.

There is a lot of Synthetic oils that use group III base stock, so make sure that you check the label and online reviews of any synthetic motor oil that you buy to know exactly where that synthetic oil comes from.

​Full synthetic oils: Groups 4 and 5 base oils

Now we dive into full synthetic motor oils, which are the ones that use either group IV or group V base oils. Let’s see it one by one.

Group IV Base Oils

I’m going to try and save you some hours of mind-numbing wikipedia articles trying to get the relevant bits of information together. (Which may aswell lead you to end up reading about Allelopathy as a result of jump after jump inside the never ending wiki)

According to wikipedia,

Poly-alpha-olefin (or poly-α-olefin, abbreviated as PAO) is a polymer made by polymerizing an alpha-olefin.

They are designated at API Group IV and are a 100% synthetic chemical compound.

It is a specific type of olefin (organic) that is used as a base stock in the production of some synthetic lubricants.

An alpha-olefin (or α-olefin) is an alkene where the carbon-carbon double bond starts at the α-carbon atom, i.e. the double bond is between the #1 and #2 carbons in the molecule

Group IV Stocks                 

When you see that a synthetic oil uses group IV base stock, it essentially means they made up their own synthetic recipe for that oil.

Therefore, synthetic oils that use Group IV base oil, come from laboratories.​

Group V base oils

Now there’s other kind of full synthetic oils, and those are the ones that use group V base stock.

Let’s bring some Wiki wisdom here.

Group V base oils are defined by API as any other type of oil other than mineral oils or PAO lubricants.

Esters are the most famous synthetics in Group V, which are 100% Synthetic chemical compounds consisting of a carbonyl adjacent to an ether linkage.

They are derived by reacting an oxoacid with a hydroxyl compound such as an alcohol or phenol.

Esters are usually derived from an inorganic acid or organic acid in which at least one -OH (hydroxyl) group is replaced by an -O-alkyl (alkoxy) group, most commonly from carboxylic acids and alcohols.

That is to say, esters are formed by condensing an acid with an alcohol.

Many chemically different “esters” due to their usually excellent lubricity are used for various reasons as either “additives” or “base stocks” for lubricants

Group V Stocks                 

​So, essentially, Group V stocks are also 100% man-made on laboratories… but then, what happens with that other synthetic oil?

Uh-uh. Natural Gas?

I’m talking about Pennzoil’s Ultra Platinum series, which stands as a Full Synthetic motor oil.

The same label reveals it “Made from Natural Gas”

So, where does natural gas come from?

Let’s have a look at what the wikipedia says…

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Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.

It is formed when layers of decomposing plant and animal matter are exposed to intense heat and pressure under the surface of the Earth over millions of years.

The energy that the plants originally obtained from the sun is stored in the form of chemical bonds in the gas

Natural Gas                 

So, unsurprisingly, Full Synthetic oils that are made using Natural Gas as a base stock, come from dinosaurs too. The main difference is that they do not use petroleoum (oil) as stock.

​Wrapping it up

As a final conclusion and wrap up to this topic, here’s the answer to the question “where does synthetic oil come from?”

  • Synthetic oils that use Group I, II and III base oils, come from petroleoum crude.
  • Synthetic Oils that use Group IV and esters from Group V, are 100% man made on laboratories.
  • Synthetic Oils that use Natural Gas (considered a Group V stock) as base stock, come from natural hydrocarbons.

That’s it! If you liked this first episode of Ask Alex, you can leave a comment below with your question, send me an email at alex@gear4wheels.com or on twitter @alexmeyergear4