The best semi synthetic oil

Updated March 23, 2017

Using the incorrect motor oil in your engine can lead to wasted money and reduced engine life. Not all motor oils are rated equally in regard to performance. When a semi-synthetic oil is recommended, knowing in advance which brands work better than others can save you headaches and engine problems down the road.

AMSOIL Semi Synthetic

According to reviewers at The Synthetic Warehouse, AMSOIL is the best product on the market with regard to cost efficiency, quality and performance. Reviewers at the Synthetic Warehouse gave AMSOIL high marks for its ability to maintain engine performance in mowing vehicles in even rough, demanding mowing conditions. According to the reviews, AMSOIL Semi Synthetic increased engine performance and protected the motor from wear, allowing it to operate at maximum efficiency. Reviewers were also impressed at AMSOIL's ability to protect the engine from heat and rated it the best choice when selecting an oil for use with four-stroke equipment.


Cycle Gear was particularly impressed with the performance of Castrol Actevo X-Tra 4T Semi-Synthetic 4-Stroke Motor Oil when used in motorcycle engines. Reviewers gave Castrol Actevo X-Tra a rating of 4.5 out of 5 stars for the oil's ability to protect the engine from wear, particularly during long trips. They were also impressed at Castrol Actevo X-Tra 4T Semi-Synthetic 4-Stroke Motor Oil's ability to protect against harmful engine deposits, which can slow down the performance of motorcycle engines and lead to decreased engine life. In addition, reviewers were pleased at the oil's performance in protecting the motorcycle's transmission.

Mobil 1 0W40

According to Doo You, a product information and consumer product review website, one of the best semi-synthetic oils on the market is manufactured and distributed by Mobil 1. The Mobile 1 0W40 semi-synthetic received 5 out of 5 stars by reviewers at Doo You for its quality of lubrication, ability to help prevent wear and assistance in carrying heat away from the engine, which can often times contribute to engine damage. Reviewers were impressed at the improvements seen in the engine performance of older vehicles when Mobil 1 0W40 was used.

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About the Author

Rebekah Worsham began writing professionally in 2007 and has been published on eHow. She has expertise in the fields of law, parapsychology and the treatment of drug and alcohol addiction. She holds a degrees in law from Beckfield College.