How Bad Are Cheap 'Diesel' Motor Oils? $14 vs $58

Mobil Delvac, Rotella T6, Royal Purple, Schaeffer’s, Hot Shot’s and Amsoil. I paid an independent oil testing lab to analyze all of the motor oils, and I performed my own testing for lubricity, resistance to thermal break down, and oil flow characteristics.

I bought all of the motor oils, paid for the oil analysis, and all of the supplies used in this review. I always pay for everything out of my own pocket to ensure an unbiased review. So, THANK YOU for supporting the channel.

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➡ Products Tested In This Video (in no particular order):
Amsoil: Available at the online Amsoil store

Videography Equipment:

This video is only for entertainment purposes. If you rely on the information portrayed in this video, you assume the responsibility for the results.

[ProjectFarm]

Here's the list of motor oils reviewed. More details in the video description. Thank you!
Amsoil: Available at the online Amsoil store

[pjkentucky]

Project Farm is still the hardest working channel on YouTube!

[mdforsberg]

Our whole semi fleet switched to amsoil and we've seen 30% less repairs with millions of miles tested. Use to run rotella like every shop but the results have been speaking for themselves. Great channel!

[tracybowling]

I don't have any diesel engines. But oil testing is always fun to watch!

[oby-]

Shell Rotella only in this household. Two Kenworths, three John Deere field tractors, two Kubota tractors, three diesel pickups. All run this oil for years with no problems. Change any oil when you should and there will be no problems. We always change before the recommended time interval.

[AquaticLogic]

Canadian here. The cold flow with the Hot Shots was WILD! Thats a game changer for winter diesel starts, especially in Powerstrokes with HEUI injectors that need oil pressure to start.

[sledhead]

I have a 2005 6.0 power stroke. I’ve been using Royal Purple since I bought the truck new. 575, 000 miles still going strong.

[rhkips]

Rotella's price to performance ratio is why it's so common in fleet applications. It's not the best, but it keeps costs low in an environment with controlled service intervals. Consistent, regular oil changes are more beneficial than any additive package that exceeds OEM requirements!

[RalphMercuroMusic]

The Shell Rotella T6 has been a common oil used in the motorcycle racing community for decades. Sportbikes (Except for some Ducati's) have a wet clutch. The transmission and engine are within the same cases and share the same oil. Motorcycle specific oil can be VERY expensive so some of us started using T6 around the year 2000. As your tests show, it contains 0 Molybdenum. Thats what makes it safe for a wet clutch. Racers also change the oil often. Usually every weekend if not more so the cost savings can be significant.
My own experience is over 25, 000 miles each on two Yamaha R1's with no engine, transmission, or clutch issues.

[isaacbrewer]

It’s so crazy how oils with the same viscosity rating act so differently in different temps. Especially the cold temps! Thanks for your great videos!

[BanjoWorx]

Thanks Project Farm for such a great video once again. This confirmed my choice of Schaeffer's for my 7.3L. Been using it for 4 years with great results!

[josephpacchetti]

Well...I've run out of ways to say how great your channel is, Thank You Todd. 👍🇺🇸

[Slasher]

Do I own a diesel? Nope. Do I plan on owning one? Nope. Did I watch the whole video? Yep. All your videos are so well done and very informative! Thanks for your work.

[danielparsons]

Every video I watch from you on every Sunday at the end of the video I always tell myself "and today I got this much smarter" and it's true because you teach us so many things with bad products and good products with no bias remarks. The best YouTube testing channel I ever watched so glad to watch every video you make❤

[johnbentzinger]

I've used Schaeffer Diesel motor oil for many years and have been very impressed.

[golfbravowhiskey]

I'm 61 years old, and since I was able to use all in all of our equipment it's been nothing but Rotella.
I have rebuilt my John Deere dozer engine which had close to 9000 hours on it and it still looked good on the bottom end, not to mention all of our logging skidders they get the piss used out of them and never had any problems out of Rotella

[thecarman]

1:41
Thanks for emphasizing that -40 degrees does not need a descriptor, as it's where both Fahrenheit and Celsius scales converge.
Another great video as always.

[ED-titc]

I used to use rotella t4. My friend uses delvac. Neither of us has had any issues. We ran 12, 000 mile intervals in our Detroits. No problem with either. Great video!

[Ollerecovery]

I like the fact that you present the data quickly and talk fast, you're quick to the point :)
Good job.

[ihydgm]

Would be nice to see you test multimeters, checking voltage, amperage, and resistance accuracy, seeing if the cheap $50 multimeters are as good as the more expensive ones