Best Synthetic Oil

It’s easy to forget how much strain we put on our vehicles engine day after day and we often take for granted how reliable they are for us. oil is used to keep the engine operating at its best., and this type of oil is either conventional or synthetic. Conventional oil is a either a crude oil or a by product of crude oil, whereas synthetic oil is a chemically modified petroleum product.

Synthetic oil has quickly become the leader and the solution of choice for vehicle owners, and in the automotive industry because of its affordability there are many different types of synthetic oil manufactured by top brands.

This has made the purchasing decision even harder, and for this reason we have created this buying guide to show you the best synthetic oil on the market.





1. Mobil 1 (120766) Extended Performance 5W-30 Motor Oil



2. Pennzoil Ultra Platinum 10W-30 Full Synthetic Motor Oil



3. Castrol 03087 EDGE Extended Performance Synthetic Oil



4. Shell Rotella (550019921) T6 5W-40 Full Synthetic Oil



5. Royal Purple 01154 API-Licensed SAE 15W-40 High Performance Synthetic Motor Oil



5. Royal Purple 01154 API-Licensed SAE 15W-40 High Performance Synthetic Motor Oil Review


The Royal Purple’s API-licensed Motor Oil is a combination of premium base oils and proprietary additive technologies which work together to create a high performance motor oil to optimize and drive engine performance.

This motor oil provides superior protection whilst improving performance in both gasoline and petrol engines. Royal Purple motor oil is also compatible with other synthetic and conventional motor oils, whilst providing a higher level of engine wear protection and increased fuel efficiency. This protection of the expensive catalytic emission system extends the life of your engine.

The oil uses its unique formulation which works to prevent metal to metal contact inside of the engine. Because of its low coefficient friction, this results in increased fuel efficient. This ensures that lubrication starvation doesn’t occur and the white sludge that is prevalent in cars using high ethanol fuel doesn’t develop. This helps to prevent rust from developing.

4. Shell Rotella (550019921) T6 5W-40 Full Synthetic Oil Review


Now if you’ve owned any kind of vehicle then you would have heard of Shell who has established themselves as one of the clear leaders in the oil and petrol industry. This full synthetic heavy duty oil has an advanced low ash additive, multi-functional technology that adapts to your driving conditions to provide a superb level of protection.

The oil also provides excellent flow even at low temperatures whilst also maintaining protection against shear-stability degradation. This provides reliable pumping on startup even in cold conditions and it will also remain thick enough in high temperatures. This resistance to heat breakdown allows it to maintain protection throughout its period of service.

This oil can provide a whole number of benefits including improved fuel economy which will save you money without causing damage to your engine or its durability. It also has advanced multi-functional dispersant additives that provide a higher level of protection against the effects of dirt and other contaminants.

3. Castrol 03087 EDGE Extended Performance Synthetic Oil Review


The Castrol EDGE Extended Performance synthetic oil features the latest Castrol technology as they continue to strive to lead the way in both innovation and quality. Engine oils need to be able to quickly respond to even the smallest changes in the environment and even when you’re driving it needs to be able to respond rapidly to the different metal to metal contact points inside your engine.

The formula provides a high level of protection for the critical engine parts within your vehicle which not only ensures top performance, but is also designed to keep your engine running for longer periods than competing brands and has claimed to run for up to 15,000 miles. This synthetic oil is able to maintain a stable viscosity even when under extreme pressure from your engine.

2. Pennzoil Ultra Platinum 10W-30 Full Synthetic Motor Oil Review

Pennzoil Ultra Platinum 10W-30 with PurePlus Technology has been created by combining their unique PurePlus synthetic base and combining it with their high performance additives. This technology is patented and uses a revolutionary process which converts pure natural gas into a high quality full synthetic base oil that can’t be found with any other product.

This creates a crystal clear base oil that is 99.5% pure and contains less impurities that the base oils made from crude oil. The technology means that the oil has an extremely low viscosity even at lower temperatures, so the engine requires less effort to pump oil around the engine.

The oil increases the overall efficiency of the engine, allowing for an extra 550 miles per year, and also helps to protect the engine from a loss of power.

1. Mobil 1 (120766) Extended Performance 5W-30 Motor Oil Review


Mobil have created an advanced full synthetic formula which helps to prevent deposits and sludge build up within your engine. This extends the life of your engine which will potentially save you a considerable amount of money. The motor oil can work effectively through a range of different environments and conditions whilst providing excellent lubrication and wear protection. This is further helped by it containing an optimal level of performance additives.

The oil also works to provide an outstanding level of engine protection in addition to superb thermal and oxidation stability. It can control its level of oil breakdown to provide whilst being compatible with engine seals. It also is great in low temperature environments and can still start your engine extremely quickly.

Mobil also offer a multipack deal allowing you to save money by buying in larger quantities. This is why it's our number 1 choice as the best synthetic oil.

Buying Guide

Conventional oil vs synthetic oil

Most people already know that synthetic oil is superior but do you know the actual reasons?

They are both produced underground, but that’s where the similarities stop. Synthetic oil is not just refined but also distilled, purified and broken down into smaller basic molecules.

This removes the impurities that are often present in crude oil and allows the individual molecules to be customized to the demands and pressures of modern vehicle engines. These newly tailored molecules provide higher protection and performance levels compared to conventional oils. The other benefits also include:

Increased engine wear protection

Because engine parts are in constant contact with other parts, this can cause them to wear and break down because they move at such high speeds. Motor oil works as lubrication and acts as a protective barrier between the engine components. Whereas conventional oil breaks down and loses its ability to prevent engine wear, synthetic oil maintain their wear protective features for much longer.

Operates better in low temperatures

When you leave your car overnight the oil in the engine settles, but when you fire up the engine in the morning it starts to flow through the main parts of the engine parts to portect it from friction. When you use conventional oils it takes longer for it to flow smoothly through the engine parts.

This is even more important in colder winter months where this flow can take even longer, but the best synthetic oils are manufactured to flow fast even at lower temperatures to provide even more protection for your engine.

Increased protection at higher temperature

The temperature within the engine can get extremely high when its running, and this can cause conventional oils to break down and evaporate leaving no protection for your engine which can lead to wear and damage. Synthetic oils are formulated to resist evaporation even in high temperatures, which is even more important if you live in an higher temperature environment.

Cleaner Engine

When oil circulates through your engine, it will often pick up deposits and when you use conventional oils this can often form a sludge which over time will lower the efficiency of your engine. In the long run this will also lower the life of your engine. Synthetic oils contain less impurities than conventional oil allowing it to provide more resistance to the sludge forming extending the overall life of your engine.

Cheaper cost

Even though the best synthetic oil is far superior to conventional oil, it still also provides a greater economic benefit. It’s recommended that conventional oil should be changed every 3-4000 miles whereas synthetic oil can last up to 7,500 miles before it needs to be changed. Synthetic oil is actually more expensive per oz but because it is considerably more longer lasting, it is the more economical choice.

Turbocharger parts protection

It’s becoming increasingly common for car manufacturers to build cars with smaller engines but then adding in turbochargers to boost its power. Turbocharged engines produce even higher temperatures so it’s even more important to have a motor oil that can lubricate effectively even in these high temperatures.

Conventional oils struggle to function at these temperatures and will often evaporate causing deposits to form on the engine components which will eventually lead to engine failure. The best synthetic oil will protect these components even better than standard conventional oils, which will boost the overall performance of your engine and vehicle.


It’s often tempting to buy the cheapest synthetic oil that’s on the market, but this may end up being a big mistake. Whilst price and your budget will always play a large role in your buying decision, it shouldn’t be the only factor in your decision.

Quality should never be compromised and spending a little extra will go a long way to ensuring that your engine is functioning in top condition. The best brands will also cost a little extra but its worth it for the added peace of mind that you’re purchasing a top quality product that will provide great results.

Car type

One of the main things you need to think about is the requirements of your car, especially the type of engine that you have. Different types of engines require different types of oils to function correctly. An easy way to find out what oil is most appropriate is by reading the label on the oil container to check its compatible.

Oil Type

There are two types of synthetic oil available to buy. The first is synthetic blend oil with is a combination blend of conventional oil and synthetic oil. The second type is full synthetic oil which is a full mix of synthetic oil and additives are used. Synthetic blend oil was created to counteract the high price of pure synthetic oil, but still provides some of the benefits of synthetics but at a more affordable price.


Viscosity is an important factor to consider and should make up a key part of your final decision when choosing a synthetic oil. Viscosity is a lubricants or liquids resistance to flowing and this is shown on the bottle of synthetic oil which rates its flow at 0 degrees Fahrenheit. The lower the viscosity the less your oil will thicken in colder conditions whereas a higher viscosity rating number will thicken slower.

If you live in a colder environment then your motor oil is more likely tho thicken faster, so it would be recommended to buy an oil with a lower viscosity because it will thicken slower. However if you live in a warmer climate then a higher number is recommended otherwise your oil will thin very quickly.


You may have noticed to word additives mentioned several times, but you may still not fully understand what we mean by this. The more additives your oil has, the better it is for preventing leaks, dirt and sludge. The main additives you should be aware of are:

Detergents- These work to remove deposits that can lead to the development and formation of high temperature corrosion, rust and deposits.

Foam inhibitors – When the crankshaft pan rotates, this causes the oil to foam, and this leads to the oil becoming less able to lubricate. These inhibitors work to disperse the foam.

Viscosity index Improvers – These work to reduce the likelihood of your oil thinning which is caused by rising temperatures.

Friction modifiers – The modifiers work by lowering the amount of friction in the engine, which results in an improvement in mileage.

Anitwear Additives – Whenever a lubricating films happens, the oil breaks down, and the additives work to help protect the metal surfaces of your engine.

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