AUTHORIZED DEALER
CALL (410) 259-1845
OUR BLOG
11/28/2017
When I first discovered AMSOIL Synthetic Motor Oil I knew about some of the other higher performance synthetic oils, such as, Royal Purple. However, immediately I wanted to see how AMSOIL compared to the other synthetic motor oil brands. I was intrigued to find A Study of SAE 5W-30 Synthetic Motor Oils. In this study 10 synthetic motor oils are put through 5 American Society of Testing and Materials (ASTM) procedures to test important areas of synthetic motor oil performance.  

The Tests Included:
  • Four-Ball Wear Test - Compares relative wear-protection
  • Total Base Number (TBN) - Tests the control of acids during combustion process
  • Cold Cranking Viscosity - Compares viscosity of lubricants at low temperatures
  • Thermo-Oxidation Engine Oil Simulation Test - Compares deposits formed under high heat
  • Noack Volatility Test - Compares loss of lubricant in high temperatures 
I wanted to compare how each motor oil performed in these tests and then provide an average score and overall ranking based on the average of all the tests rankings. The rankings would be 1-10 based on the synthetic motor oil's performance in each test, 1 being the best and 10 being the worst. The purpose will be to provide a quick summary of the study, while, providing a final overall ranking and average score for each synthetic oil tested.

Please keep in mind this study was published in June 2013 and the test results posted reflect the properties of the synthetic motor oils available for purchase at the time of testing. The test results do not reflect properties of those oils reformulated since testing.  

The Final Ranking is based on the average score which is the average ranking across all tests. The rankings are broken down for each test from left to right. This is to give a better visual of the more consistent performing synthetic motor oils.


  1. AMSOIL Signature Series (1,1,1,2,3) Average Score 1.60

  2. Pennzoil Ultra (5,5,3,5,2) Average Score 4.00

  3. Valvoline SynPower (3,6,6,3,9) Average Score 5.40

  4. Castrol Edge with Titanium Fluid Strength Tech. (9,2,8,1,8) Average Score 5.60

  5. Quaker State Ultimate Durability (7,8,2,7,6) Average Score 6.00

  6. Red Line High Performance (6,3,10,10,1) Average Score 6.00

  7. Royal Purple High Performance (4,7,9,6,5) Average Score 6.20

  8. Lucas Synthetic (2,10,5,4,10) Average Score 6.20

  9. Mobil 1 Extended Performance (10,4,4,9,4) Average Score 6.20

  10. Petro-Canada SUPREME Synthetic (8,9,7,8,7) Average Score 7.80
Below is additional detail on the rankings of each test.
 
Four-Ball Wear Test: Ranking based on Average Scar Diameter (mm)
1. AMSOIL Signature Series
2. Lucas Synthetic
3. Valvoline SynPower
4. Royal Purple High Performance
5. Pennzoil Ultra
6. Red Line High Performance
7. Quaker State Ultimate Durability
8. Petro-Canada SUPREME Synthetic
9. Castrol Edge with Titanium Fluid Strength Technology
10. Mobil 1 Extended Performance  

Total Base Number (TBN): Ranking is on based on the Total Base Number (TBN)
1. AMSOIL Signature Series
2. Castrol Edge with Titanium Fluid Strength Technology
3. Red Line High Performance
4. Mobil 1 Extended Performance
5. Pennzoil Ultra
6. Valvoline SynPower
7. Royal Purple High Performance
8. Quaker State Ultimate Durability
9. Petro-Canada SUPREME Synthetic
10. Lucas Synthetic  

Cold Cranking Viscosity: Ranking is based on the Viscosity @ -22 degrees Fahrenheit
1. AMSOIL Signature Series
2. Quaker State Ultimate Durability
3. Pennzoil Ultra
4. Mobil 1 Extended Performance
5. Lucas Synthetic
6. Valvoline SynPower
7. Petro-Canada SUPREME Synthetic
8. Castrol Edge with Titanium Fluid Strength Technology
9. Royal Purple High Performance
10. Red Line High Performance  

Thermo-Oxidation Engine Oil Simulation Test: Ranking is based on Total Deposit Weight(mg)
1. Castrol Edge with Titanium Fluid Strength Technology
2. AMSOIL Signature Series
3. Valvoline SynPower
4. Lucas Synthetic
5. Pennzoil Ultra
6. Royal Purple High Performance
7. Quaker State Ultimate Durability
8. Petro-Canada SUPREME Synthetic
9. Mobil 1 Extended Performance
10. Red Line High Performance    

Noack Volatility Test: Ranking is based on Oil  % Weight Lost (Oil Burned) after exposure to heat and circulating air for 60 minutes
1. Red Line High Performance
2. Pennzoil Ultra
3. AMSOIL Signature Series
4. Mobil 1 Extended Performance
5. Royal Purple High Performance
6. Quaker State Ultimate Durability
7. Petro-Canada SUPREME Synthetic
8. Castrol Edge with Titanium Fluid Strength Technology
9. Valvoline SynPower
10. Lucas Synthetic

FIND PRODUCTS FOR YOUR

AMSOIL Synthetic Oil and Lubricant Dealer

My name is Kevin Eyre, Independent AMSOIL Dealer, T-1 Certified since 2015. Graduating from the University of Arizona, in Agricultural Technology Management, with an emphasis in Turfgrass Management, gave me an interest in equipment maintenance and lubrication. The turfgrass industry is one that relies heavily on its machines, and if they are not properly maintained, repairs and downtime can be costly to turf managers. Looking back I was always intrigued with the maintenance and lubrication of all kinds of equipment, pondering over what brands of oil are the best, and with so many to choose from, I would commonly ask myself if there were performance benefits from one brand to the next. Growing up around heavy equipment, my family owning and operating a bus company, working on several golf courses, and owning a small delivery service, I quickly became to realize the importance of using high quality lubricants. Equipment downtime is the last thing you want in the middle of your busy season. Personally putting AMSOIL synthetic lubricants to the test has been very helpful in witnessing the benefits of AMSOIL products, to include cooler operating temperatures, burning less oil, and overall increased protection under extreme working conditions.
Follow Us on Twitter

Loading tweets.

SAVE APPROXIMATELY 25% ON EVERY ORDER

Register as an AMSOIL Preferred Customer and save approximately 
25% on all AMSOIL products.
- FREE subscription to AMSOIL Magazine
- Premium protection and performance for all of your vehicles and equipment

- Access to the entire AMSOIL product line at wholesale prices