53 tests

Engine Oil & Fluids

Motor oils, synthetics, additives, and the fluids that keep an engine alive, tested for real wear protection. Shoppers cross-shopping fully synthetic engine oil, heavy duty motor oil, high quality motor oil and car motor oil land here for the head to head that settles it.

Category leaderboard

Brands that won the most head-to-head tests in this category.

1Red Line3 wins
2Pennzoil3 wins
3AMSOIL2 wins
4Shell Rotella2 wins
5Amsoil2 wins
6Liqui Moly1 win

What actually won in engine oil & fluids

Products named as the winner by the independent tests indexed on this page. We have not tested anything ourselves.

Liqui Moly MOS2 Anti-Friction Engine Treatment
Won: Which Motor Oil Additives Brand Wins?
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Anti-Seize aluminum anti-seize lubricant
Won: Which Engine Oil Contaminant Brand Wins?
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Red Line SuperCool
Won: Which Engine Coolant Additive Brand Wins?
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Motorcraft Full Synthetic
Won: Motor Oil 2024 Test: Which Brand Wins?
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Harvest King
Won: Which Chainsaw Bar And Chain Oil Brand Wins?
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Red Line D6 ATF
Won: Which Automatic Transmission Fluid (Dexron VI) Brand Wins?
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All engine oil & fluids tests

Engine Oil & Fluids2026

Which Motor Oil Additives Brand Wins?

Liqui Moly MOS2

Category leaderboard

What actually won in engine oil & fluids

All engine oil & fluids tests

Which Motor Oil Additives Brand Wins?

Which Engine Oil Contaminant Brand Wins?

Which Engine Coolant Additive Brand Wins?

Motor Oil 2025 Test: Which Brand Wins?

Diesel Motor Oil 2024 Test: Which Brand Wins?

Motor Oil 2024 Test: Which Brand Wins?

Which Chainsaw Bar And Chain Oil Brand Wins?

Which Motor Oil Viscosity Brand Wins?

Which Automatic Transmission Fluid (Dexron VI) Brand Wins?

Motor Oil 2023 Test: Which Brand Wins?

Which Oil Stop Leak Additive Brand Wins?

Motor Oil Nov 2022 Test: Which Brand Wins?

Motor Oil Jun 2022 Test: Which Brand Wins?

Motor Oil Aug 2021 Test: Which Brand Wins?

Motor Oil Mar 2021 Test: Which Brand Wins?

Which Oil Treatment Additive Brand Wins?

Which Cutting Oil Brand Wins?

Which Two-stroke Oil Brand Wins?

Motor Oil Apr 2020 Test: Which Brand Wins?

Synthetic Motor Oil (5W-30) 2020 Test: Which Brand Wins?

Motor Oil Feb 2020 Test: Which Brand Wins?

Transmission Additive: The Test Results

Diesel Motor Oil 2019 Test: Which Brand Wins?

Motor Oil Nov 2019 Test: Which Brand Wins?

Motor Oil Oct 2019 Test: Which Brand Wins?

Motor Oil Sep 2019 Test: Which Brand Wins?

Motor Oil Jul 2019 Test: Which Brand Wins?

Synthetic Motor Oil (5W-30) 2019 Test: Which Brand Wins?

Which Motor Oil (tournament Semifinal Round) Brand Wins?

Motor Oil Jun 3, 2019 Test: Which Brand Wins?

Motor Oil Jun 1, 2019 Test: Which Brand Wins?

Motor Oil May 2019 Test: Which Brand Wins?

Which Engine Oil Brand Wins?

Which Synthetic Motor Oil (playoff Bracket) Brand Wins?

Motor Oil Apr 22, 2019 Test: Which Brand Wins?

Synthetic Motor Oil Apr 2019 Test: Which Brand Wins?

Motor Oil Apr 1, 2019 Test: Which Brand Wins?

Synthetic Motor Oil Mar 18, 2019 Test: Which Brand Wins?

Synthetic Motor Oil Mar 4, 2019 Test: Which Brand Wins?

Motor Oil Feb 2019 Test: Which Brand Wins?

Oil Additive Jul 2018: The Test Results

Which Two-stroke Engine Oil Brand Wins?

Bar And Chain Oil: The Test Results

Engine Oil / Crankcase Treatment: The Test Results

Oil Additive Apr 2018: The Test Results

Engine Oil: The Test Results

Oil Additive Feb 2018: The Test Results

Motor Oil 2017 Test: Which Brand Wins?

Which Engine Oil Additive Brand Wins?

Which Oil Additive Brand Wins?

Which Oil Additive (anti-friction / Dry-run Engine Protection) Brand Wins?

Which Fuel And Oil Additive Brand Wins?

Which Engine Oil Additive Claims Brand Wins?

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