2025 test6 productsEngine Oil & Fluids
Which Motor Oil Brand Wins?
A head-to-head test of 6 motor oil options with the measured results for each. See how they ranked and watch the full test video.
Ranked first
Motorcraft Diesel Engine 10W-30
Price shown in test: $32
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The measured results
Every number below is read straight from the test. Scroll sideways to see all measurements. Products are listed in the order they finished.
| Product | Made By | Claims | Evaporative Loss Noack Test | Lubricity Wear Scar Test | Cold Flow Fresh At 40 Below | Cold Flow After Heat At 40 Below | Oil Lab Anti Wear Additives | Oil Lab Total Base Number | Oil Type | Made In | Certifications | Oil Lab Additive Note | Cold Flow All Races | Cold Flow Degradation After Heat | Oil Lab Detergent Dispersant | Note | Designed For | Cold Flow Room Temp |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1Motorcraft Diesel Engine 10W-30$32 | distributed by Ford Motor Company | more than 1,000 parts per million phosphorus for better wear protection, recommended for power stroke diesel engines, warns against use in catalyst-equipped gasoline engines | 410.82 g dropped to 402.13 g, a loss of 8.69 g; lost this specific 2-oil comparison to the Mobil 1 10W-30's 5.26 g loss | 5.57 mm wear scar, beat the Mobil 1 10W-30's 6.23 mm; finished a very close second overall (across all 6 oils) behind the Motul motorcycle oil's 5.47 mm | about 30 seconds slower than the Mobil 1 10W-30 in the diesel/gasoline/0W-8/aviation race | finished third in that group's race at 1 minute 47 seconds; only slowed by 8% after heat exposure, the best (least) percentage slowdown of the three oils given a specific percentage figure | 2,128 parts per million, helping explain its strong lubricity test result | in the general range of 6.9 to 7.8 stated for most oils in this test (aviation oil excluded as an outlier); exact individual TBN not given | not tested | not tested | not tested | not tested | not tested | not tested | not tested | not tested | not tested | not tested |
| 2Mobil 1 10W-30 (automotive)$30 | not tested | designed to last 10,000 miles, claims 10 times more wear protection, fights sludge | 404.68 g dropped to 399.42 g, a loss of only 5.26 g; won this specific 2-oil comparison against the Motorcraft diesel oil | 6.23 mm wear scar, about 12% larger than the Motorcraft diesel oil's scar; lost this specific comparison | finished second in the diesel/gasoline/0W-8/aviation race at 1 minute 11 seconds | passed the Motorcraft to finish second in that group at 1 minute 38 seconds | not tested | not tested | advanced full synthetic | USA | API SP; claims to exceed ILSAC GF-6A requirements | host states the Mobil 1 0W-8 has 'about twice' the anti-wear additive and detergent/dispersant content of this 10W-30 oil; no specific ppm figure given for the 10W-30 itself in the transcript | not tested | not tested | not tested | not tested | not tested | not tested |
| 3Mobil 1 0W-8$28 | not tested | designed to increase engine efficiency, provide startup protection, and fight sludge | 405.83 g dropped to 400.12 g, a loss of 5.71 g; lost this specific comparison to the Phillips 66 aviation oil's 2.39 g | 6.56 mm wear scar, described as the most damage of any oil tested in this video | not tested | not tested | 2,494 parts per million, described as a very aggressive anti-wear additive package, about twice the content of the Mobil 1 10W-30 | not tested | extremely thin viscosity full synthetic | USA | API SP | not tested | won every single flow-speed race in the video (room temperature, fresh at -40 F, and heat-exposed at -40 F), described as 'not even close' in multiple rounds | slowed down by 12% after heat exposure | about twice the detergent/dispersant content of the Mobil 1 10W-30 | not tested | not tested | not tested |
| 4Phillips 66 20W-50 Aviation$53 | not tested | claims easier starting and quick lubrication at low temperatures, claims high film strength for wear protection at high temperatures | 399.25 g dropped by only 2.39 g, the best (lowest) evaporative loss of all six oils tested | 6.35 mm wear scar, second worst of the lineup, close behind the Mobil 1 0W-8's 6.56 mm | by far the slowest oil in its race, finishing in about 3 minutes 22 seconds | remained the slowest, finishing in about 4 minutes 20 seconds | not tested | only 0.6, a dramatic outlier compared to the 6.9 to 7.8 range of the other five oils | mineral-based ashless dispersant multigrade oil for aviation piston engines | USA | not tested | not tested | not tested | not tested | only trace levels, the lowest of the lineup | the only oil tested in 20W-50 viscosity; host could not find a 10W-30 aviation oil to match the other products | not tested | not tested |
| 5Motul 10W-30 Motorcycle$53 per gallon | not tested | not tested | lost only 2.62 g, second best of all six oils, very close behind the Phillips 66 aviation oil | 5.47 mm wear scar, the BEST (smallest) of all six oils tested | finished about a minute slower than the marine oil in their race at 2 minutes 37 seconds | finished in 3 minutes 33 seconds, notably slower than the marine oil's 1 minute 53 seconds | 2,052 parts per million, described as a very good additive package | not tested | claims 100% synthetic, may contain ester | France | meets JASO T903 motorcycle specification | not tested | not tested | not tested | not tested | not tested | not tested | not tested |
| 6Quicksilver 10W-30 Marine$30 | not tested | claims to outperform automotive oils in marine applications, provides wear and corrosion protection, eliminates thermal breakdown under extreme RPM/temperature/load | 399.52 g, lost a total of 5.25 g | 5.98 mm wear scar, described as better than average but not enough to beat the Motorcraft diesel's 5.57 mm | won its race against the Motul motorcycle oil, finishing in about 1 minute 40 seconds versus Motul's 2 minutes 37 seconds | won again, finishing in 1 minute 53 seconds versus Motul's 3 minutes 33 seconds | not tested | not tested | not tested | blended in the US with foreign and domestic materials | not tested | not tested | not tested | slowed down by 13% after heat exposure, the worst percentage figure given among the oils with a stated percentage | not tested | not tested | four-stroke marine engines | finished last (slowest) of the three-oil room-temperature race against the Motul motorcycle oil and Mobil 1 0W-8 |
How it was tested
- oil flow speed at room temperature (~85 F)
- oil flow speed at -40 F (fresh oil)
- oil flow speed at -40 F (after heat/Noack exposure)
- Noack volatility / evaporative loss test (200 g of oil heated to ~400 F for 2 hours)
- lubricity / film strength wear-scar test
- independent oil lab analysis (wear metals, detergents/dispersants, anti-wear additives, total base number)