Why Choose AMSOIL
AMSOIL has a documented history of innovation and leadership in the lubricants industry, but don’t just take our word for it. See for yourself how our products hold their own with the following comparative AMSOIL oil testing results.
| Motor Oils Tested | Test Areas |
| AMSOIL ATM Mobil 1 Extended Performance Quaker State Advanced Full Synthetic Pennzoil Platinum Trop Artic Motorcraft Castrol GTX Chevron Supreme Havoline Formula Shell Pennzoil | Thin Film Oxygen Uptake (ASTM D-4742) High Temperature/High Shear (ASTM D-4683) NOACK Volatility (ASTM D-5800) Pour Point (ASTM D-97) Total Base Number (ASTM D-2896) Cold Cranking Simulator (ASTM D-5293) Four-Ball Wear (ASTM D-4172) |
AMSOIL Synthetic 10W-30 Motor Oil (ATM) soundly outperformed competitors across a series of ASTM motor oil tests. It and 10 competing conventional and synthetic 10W-30 motor oils were subjected to seven tests. The competing oils included petroleum-based Castro GTX Drive Hard, Mobil Drive Clean, Pennzoil with Purebase, Quaker State Peak Performance and Valvoline, as well as synthetic-based Valvoline Synpower, Quaker State, Castrol Syntec, Pennzoil and Mobil SuperSyn Multi-Vehicle.
Test 1: Thin-Film Oxygen Uptake Test (TFOUT) which measures the oxidation stability of engine oils. Results: AMSOIL 10W-30 demonstrated superior heat and oxidation resistance.
Test 2: High Temperature/High Shear Test (HTHS) which measures a lubricant's viscosity under severe operating conditions.
Results: AMSOIL 10W-30 exhibited superior viscosity stability and did not “shear back” and thin out like other motor oils.
Test 3: NOACK Volatility Test measures the evaporation loss of oils in high temperature service.
Results: AMSOIL 10W-30 resisted high temperature volatilization (evaporation) better than other motor oils to maintain peak fuel efficiency, thus reducing oil consumption and emissions.
Test 4: Pour Point indicates the lowest temperature at which a fluid will flow.
Results: Tests proved AMSOIL 10W-30 Synthetic Motor Oil capable of remaining fluid down to -58° F.
Test 5: Total Base Number (TBN) is the measurement of a lubricant's reserve alkalinity for combating acids.
Results: AMSOIL Synthetic 10W-30 has a very high TBN, allowing it to effectively combat wear-causing contaminants and acids. This provides superior protection and performance over extended drain intervals.
Test 6: Cold Cranking Simulator Test (CCS) measures a lubricant's viscosity at low temperatures and high shear rates.
Results: The low cold crank viscosity of AMSOIL Synthetic 10W-30 reduces drag on moving engine parts and allows engines to achieve critical cranking speed in extremely frigid temperatures.
Test 7: Four-Ball Wear Test measures a lubricant's wear protection properties.
Results: Tests show that AMSOIL 10W-30 Motor Oil has better anti-wear performance than all other oils combined.
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