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A big chunk of your car’s maintenance service is an oil change. Whether it’s you or the trusted mechanic who will perform it, you will be given a couple of choices for your engine oil: conventional (regular), semi-synthetic, and fully synthetic.

It’s not that difficult to define the difference between the three. But if you’re out there to treat your car like royalty, you would likely go for fully synthetic.

Conventional oil is widely used by car owners as it gives sufficient lubrication performance to your engine without cracking your savings. It’s a decent deal. However, having a synthetic provides better performance and lasting protection to your vehicle – which also leads to bigger savings in the long run.

There are a lot of popular synthetic oil brands that you can see on the shelf. You have Mobil, Royal Purple, Shell, Pennzoil, and Valvoline to name a few. While these products no longer have to prove their credibility and performance, there are also brands that keep it low-key – but still offer quite acceptable quality, just like Harvest King.

About Harvest King

While Harvest King sounds pretty unfamiliar, the company that launched the brand is considered as one of the world’s biggest, independent blenders of private label oil. In fact, North America’s largest to be exact.

Catering high-quality lubricants, Warren Oil Company (Warren Unilube) serves various industries such as automotive, agriculture, commercial, and heavy-duty.

Harvest King Synthetic Oil Review

While some may assume that Harvest King is blended from the backyard, the company claims that each bottle of Harvest King synthetic oil contains high-value car engine oils specially designed for quality lubrication processes on every vehicle engine.

Its ingredients make up the synthetic oil base which promotes cleaner and better performing engines that can withstand both high and low temperatures and weather conditions. This also helps to avoid pre-ignition, eventual wear, and other factors that could compromise the car’s safety.

Harvest King is also proud to meet API SN Plus standards while also ensuring improved fuel mileage and lower emissions.

Along with the API certification, Harvest King also boasts of its green light from Dexos which ensures the motor oil’s total efficiency.

Compared to conventional oil, Harvest King synthetic oil has its way of reducing deposits and increasing refinement levels. It flows more freely and does not require frequent oil changes once applied.

Harvest King Fully Synthetic Oil Products

1. SAE 5W-30 Motor Oil – Used for gasoline engines, the SAE 5W-30 Motor Oil is one of Harvest King’s full synthetic best-sellers. This formula gives great protection to your engine compared to using regular and semi-synthetic blends. The Harvest King SAE 5W-30 has earned approval for GM Dexos 1 2nd Gen.

2. SAE 10W-30 Motor Oil – This fully synthetic motor oil has been reviewed to provide high performance at an affordable cost. It helps precision parts to run clean. It also attained the ILSAC GF-6 Resource Conserving approval. This particular product exceeds Gm 6094M and FCA/Chrysler MS-6395 while also meeting Toyota and Honda service fill specifications.

3. SAE 5W-20 Motor Oil – Harvest King’s SAE 5W-20 is suitable for passenger cars, sport utility vehicles, and light trucks with the capacity to meet Ford, Honda, and Toyota specs. It is also approved for API SN/GF-5 or GM dexos1.

Overall, Harvest King synthetic oil promotes better engine performance and extended engine life. It can be costly compared to conventional, but it is quite a bargain stood beside the popular synthetic oil brands.

They are high-quality products, and surprisingly the customers who have used Harvest King have no negative performance comments so far. It just seems that they just don’t put much work into advertising but with its function and cost? Lucky are those who have discovered them.

If you’re still in doubt about the quality, you may go for the top 5 mentioned brands in the first part of this review – but it will surely cost you double the price of this underrated king.

Harvest King Synthetic Oil Pros and Cons



  • Low Price Tag
  • Unfamiliar brand name
  • Maximized Fuel Economy
  • Not as tested as its competitors
  • Can withstand extreme temperatures
  • Widely Available in-store and online
  • Dexos and API-certified
  • Better performance compared with regular oil
  • Cleans and protects the piston

Frequently Asked Questions (FAQ)

Harvest King Lubricants, a division of Federated Co-operatives Ltd, produce Harvest King synthetic oil. The company produces high-quality lubricants designed to meet the needs of agricultural, industrial, and automotive markets worldwide. Their advanced synthetic blend technology has made them one of the leading providers of motor oil in Canada. Their products are extensively tested for performance and reliability in extreme and harsh climates, making them ideal for any application. With their commitment to quality, Harvest King is a brand you can trust to keep your vehicle running smoothly.
Adding zinc to oil has a variety of benefits. Zinc is an essential element for keeping engine components lubricated and reducing wear. An additive containing zinc helps reduce friction, which in turn can improve engine performance and fuel economy. It also helps prevent rust, corrosion, and the buildup of sludge on the internal parts of your engine. The addition of zinc also extends the life of your oil by helping it resist oxidation and thermal breakdown at higher temperatures. Finally, zinc can help enhance chemical properties that protect against the damaging effects of extreme pressure on moving parts. Overall, adding zinc to oil provides added protection for your vehicle’s engine components.


David Muench (Carnes Mechanical)

David Muench (Carnes Mechanical)

Hey, I’m David. I’ve worked in a cars store for 6 years. I write reviews and guides, helping people to choose the most suitable technicals and best product for them. I’m happy to finally share my knowledge of the industry here, on CarnesMechanical.

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