10 Best Synthetic Engine Oils

Last Updated December 2019 Based on 3829 Reviews
1 Best of the Best!
AmazonBasics High Mileage Motor Oil, Full Synthetic, SN Plus, dexos1-Gen2, 5W-30, 5 Quart
AmazonBasics AmazonBasics High Mileage Motor Oil, Full Synthetic, SN Plus, dexos1-Gen2, 5W-30, 5 Quart
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9.8 Greet
Product Highlights
  • High-mileage full-synthetic motor oil (5W-30, 5 quart); offers higher level of protection for engines over 75,000 miles and longer drain intervals
  • Formulated to reduce likelihood of Low Speed Pre-Ignition; reduces friction for improved fuel economy and protection against engine wear
  • High resistance to viscosity and thermal breakdown
  • Helps to fight volatility burn-off to minimize engine deposits and exhaust emissions
  • dexos1 Gen 2, API SN Plus, and ILSAC GF-5 approved; always follow vehicle manual recommendations
2
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)
Shell Rotella T Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)
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9.7 Greet
Product Highlights
  • Provides 1.5% improved fuel economy performance compared to SAE 15W-40 oils
  • Triple Protection Plus formula combines fully synthetic base oils with advanced additives for excellent equipment protection and long engine life
  • Formulated with additive technology that protects against the effects of soot, dirt and other contaminants
  • Engineered with shear stability to resist viscosity loss and maintain optimal engine oil pressure
  • Suitable for diesel-powered vehicles from tractor/trailers to classic cars and heavy-duty diesel pickups that allow an SAE 5W-40
3
Castrol 03124 EDGE 0W-20 Advanced Full Synthetic Motor Oil, 5 Quart
Castrol Castrol 03124 EDGE 0W-20 Advanced Full Synthetic Motor Oil, 5 Quart
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9.3 Greet
Product Highlights
  • Advanced premium full synthetic motor oil to offer strength under extreme pressure
  • Titanium strong for maximum engine performance
  • Reduces metal-to-metal contact across a range of different driving speeds
  • Protects the engine for the entire drain interval even under extreme pressure
  • Decreases engine deposit formation to help maximize engine response
  • Best full synthetic money can buy
  • API SN, ILSAC GF-5, ACEA A1/B1, GM dexos1, Meets Ford WSS-M2C947-A, Meets engine test requirements of Chrysler MS-6395
  • Castrol recommends the use of Bosch oil filters
4
Castrol 03060 GTX MAGNATEC 0W-20 Full Synthetic Motor Oil, Green , 5 Quart
Castrol Castrol 03060 GTX MAGNATEC 0W-20 Full Synthetic Motor Oil, Green , 5 Quart
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9.2 Greet
Product Highlights
  • -Dramatically reduce engine wear
  • -Leave critical engine parts 4X smoother* * As tested in the industry Sequence IVA wear test
  • -Superior wear protection on critical engine parts
  • -Unsurpassed level of protection against viscosity breakdown
  • -Unique full synthetic technology to fight against harmful sludge build-up
  • -High level of fuel economy based on US industry standards
  • -API SN; ILSAC GF-5; GM dexos1
  • Castrol recommends the use of Bosch oil filters
5
Castrol 03084 EDGE 5W-30 Advanced Full Synthetic Motor Oil, 5 Quart
Castrol Castrol 03084 EDGE 5W-30 Advanced Full Synthetic Motor Oil, 5 Quart
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9.1 Greet
Product Highlights
  • Advanced premium full synthetic motor oil to offer strength under extreme pressure
  • Titanium strong for maximum engine performance
  • Reduces metal-to-metal contact across a range of different driving speeds
  • Protects the engine for the entire drain interval even under extreme pressure
  • Decreases engine deposit formation to help maximize engine response.Instructions:Take advantage of the 1 QT bottle for quick oil changes and top-offs
  • Best full synthetic money can buy
  • API SN, ILSAC GF-5, ACEA A1/B1, A5/B5, GM dexos1, Meets Ford WSS-M2C929-A, Ford WSS-M2C946-A, Honda HTO-06, Meets engine test requirements of Chrysler MS-6395
  • Castrol EDGE is 3X stronger than Mobil 1 against viscosity breakdown* *Tested in the ASTM D6278 test in the 5W-30 viscosity grade.
  • Castrol recommends the use of Bosch oil filters
6
Valvoline  Advanced Full Synthetic SAE 0W-20 Motor Oil 1 QT
Valvoline Valvoline Advanced Full Synthetic SAE 0W-20 Motor Oil 1 QT
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8.9 Very good
Product Highlights
  • Excellent engine cleanliness through superior sludge and varnish protection
  • Outstanding high-temperature protection under severe driving conditions and superior cold-temperature protection through faster oil flow at start-up
  • Helps maintain fuel efficiency
  • Meets the performance requirements of virtually all naturally aspirated, turbocharged and supercharged passenger cars operating in North America
  • For any product use or product technical questions call 1-800-TEAM-VAL
7
Castrol 03057 GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, Green , 5 Quart
Castrol Castrol 03057 GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, Green , 5 Quart
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8.5 Very good
Product Highlights
  • Dramatically reduce engine wear
  • Leave critical engine parts 4X smoother
  • Add a layer of protection during warm-up and beyond
  • Cling to critical engine parts when the oil drains down
  • API SN; ILSAC GF-5; GM dexos1; Meets Ford WSS-M2C929-A; Meets Ford WSS-M2C946-A; Meets the performance of GM 6094M
  • Castrol recommends the use of Bosch oil filters
8
Briggs & Stratton SAE 5W-30 Synthetic Small Engine Motor Oil - 32 Oz. 100074
Briggs & Stratton Briggs & Stratton SAE 5W-30 Synthetic Small Engine Motor Oil - 32 Oz. 100074
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8.1 Very good
Product Highlights
  • 100% Synthetic SAE 5W-30
  • For Use In All Air Cooled 4-cycle Engines
  • 32 Oz. bottle
9
Quicksilver 8M0078623 FC-W 4-Stroke Synthetic Blend 25W-40 Marine Engine Oil, 1-Gallon
QuickSilver Quicksilver 8M0078623 FC-W 4-Stroke Synthetic Blend 25W-40 Marine Engine Oil, 1-Gallon
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7.8 Good
Product Highlights
  • Formulated to protect against corrosion and excessive wear
  • Designed for use with all 4-stroke marine engines
  • Offers outstanding strength and viscosity retention
  • 1 gallon bottle
  • 25W-40 viscosity
10
Valvoline  Premium Blue  Extreme SAE 5W-40 Synthetic Engine Oil 1 GA, Case of 3
Valvoline Valvoline Premium Blue Extreme SAE 5W-40 Synthetic Engine Oil 1 GA, Case of 3
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7.6 Good
Product Highlights
  • Valvoline Premium Blue Engine oil is "The Only One" exclusively endorsed and recommended by Cummins
  • Superior synthetic base stocks provide faster, safe starts during freezing weather and enhanced thermal properties for hot weather operations
  • Enhanced protection against oil oxidation
  • Improved fuel economy potential over conventional 15W-40 oils
  • Excellent deposit protection. For any product or technical questions, please call 1-800-TEAM VAL

Releted Reviews

10 Best Oil Synthetics View list
  • 1 AmazonBasics High Mileage Motor Oil, Full Synthetic, SN Plus, dexos1-Gen2, 5W-30, 5 Quart AmazonBasics High Mileage Motor Oil, Full Synthetic, SN Plus, dexos1-Gen2, 5W-30, 5 Quart
  • 2 Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3) Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)
  • 3 Castrol 03124 EDGE 0W-20 Advanced Full Synthetic Motor Oil, 5 Quart Castrol 03124 EDGE 0W-20 Advanced Full Synthetic Motor Oil, 5 Quart
10 Best Engine Oil Treatments View list
  • 1 Prolong Super Lubricants PSL11000 Engine Treatment  - 12 oz. Prolong Super Lubricants PSL11000 Engine Treatment - 12 oz.
  • 2 BestLine Premium Synthetic Engine Treatment 1-Pack BestLine Premium Synthetic Engine Treatment 1-Pack
  • 3 STP Oil Treatment (15 fluid ounces) STP Oil Treatment (15 fluid ounces)
10 Best Engine Treatments View list
  • 1 Slick 50 750002 Recharged High Mileage Engine Treatment, 15-Ounce Slick 50 750002 Recharged High Mileage Engine Treatment, 15-Ounce
  • 2 Star Brite Blue 1 Gallon 93000N Startron Gasoline Additive Star Brite Blue 1 Gallon 93000N Startron Gasoline Additive
  • 3 Small Engine Repair Haynes TECHBOOK for 5HP and Less Small Engine Repair Haynes TECHBOOK for 5HP and Less