10 Reviews: Best Motor Oil for Diesel Engine (Apr 2024)

Shell Rotella T6, the most common synthetic oil for diesel engines, is another excellent 100% synthetic oil appropriate for diesel engines and possibly the best when considering pricing. Furthermore, Shell Rotella T6 is a high-duty diesel engine oil that can withstand various driving circumstances. However, this oil will meet your needs, whether low-temperature or high-temperature protection.

"This is the only oil we put in the powerstroke 6.0 and 6.4. The 6.4 especially; it has issues with the lifters already. This is great oil and has given us awesome results. Not going to find a better deal on it and shipped right to your door."

by Pat's Precision Auto & Diesel

Motul 8100 X-cess is a one-of-a-kind synthetic that can be used in diesel and gasoline engines. On the other hand, this oil is developed to be 100% synthetic and is suited for large displacement diesel and direct injection gasoline engines. Furthermore, this oil is offered in cases of four jugs totaling 20 liters. Yes, it’s a little more costly, but whether your truck has a Duramax or Power Stroke engine, Motul 8100 X-cess is hard to match.

"Many Subaru performance shops only recommend Motul. This oil doesn’t brake down as fast as other oils do. You can research Motul for yourself and see why many people only use Motul. This is the only oil I’ll ever use for my wrx."

by Aaron

Schaeffer Manufacturing is a synthetic diesel engine oil with several advanced properties such as oxidation resistance, increased wear prevention, and superior soot management. On the other hand, this oil is ideal for using the Schaeffer SynShield in combination with ultra-low sulfur diesel fuel. Furthermore, this synthetic motor oil for diesel cars surpasses API CK-4 standards, lowering friction and wear even under extreme running situations.

"Good product from a reputable company"

by Randy Reynolds

Many automobile enthusiasts swear by Liqui Moly products, whether fuel injector cleaning, engine flush, or other additives, and their motor oil line is excellent but pricey. In addition, this synthetic oil provides unrivaled protection against friction and wear and may last thousands of miles longer than traditional diesel engine oils before losing efficacy. When you swap over, you should see a slight improvement in fuel efficiency.

"This is the best oil i've ever used. Better than rotella t6. Both work but this stuff is much higher quality. As far as i'm concerned its worth the extra cost."

by Michael Russell

With good reason, Mobil 1 synthetic oil has been at the top of every gasoline-powered car’s list for many years. While not as famous for diesel engines, Mobil 1 Synthetic for Turbo Diesel Trucks provides the same level of protection. Moreover, this oil will preserve your machine over a wide temperature range, reducing sludge and varnish accumulation. Hence, whether you’re traveling down the highway or hauling a trailer up a steep slope, this oil will keep your engine cleaner, cooler, and more efficient.

"Love the protection quality of Mobile 1. Superior lubrication"

by Micheal falls

Lucas Oil Products Inc. is another American manufacturer of high-quality motor oil. Additionally, this synthetic motor oil is designed to function well in heavy-duty diesel and gasoline engines of any age. Furthermore, like other premium products, Lucas Oil synthetic motor oil may cost a little more upfront. Still, your machine will be well preserved long when other synthetic lubricants begin to break down.

"I use this oil in my Generac whole house generator. I really like the Lucas brand and feel it lasts longer than the other brand I was using. I will keep using Lucas Oil."

by D. Behrendt

Ford Motor Company recommends Motorcraft SAE 5W-40 Full Synthetic Diesel Motor Oil a high-performance light and heavy-duty diesel engine oil. In addition, this oil is especially suggested for use in Ford cars with power stroke engines and trucks, buses, construction, and other heavy-duty diesel engine applications. Furthermore, this oil will also fulfill API service category CJ-4, which is necessary for use in diesel engines intended to meet 2007 on-highway exhaust pollution requirements and require ultralow sulfur diesel fuel.

"Extra heavy duty synthetic diesel motor oil , performs cooler, in colder and hotter temps, last longer between changes, keep 6.7 diesel (or any diesel) motor quieter... ideal for service and over worked diesel motors"

by Steven Jr.

The Royal Purple 15W-40 Oil recipe is a fully synthetic motor oil composed chiefly of high-grade base lubricants. In addition, these additions enhance the chemical composition of this motor oil, allowing for increased efficiency. It will not harm the vehicle’s hardware despite being severe on particles. Furthermore, this oil is suitable for gasoline and diesel engines, making it a reliable choice.

"Been using Royal Purple in my diesel engine for last 10 years. Holding up extremely well."

by Pete Green

The Castrol GTX Magnatec Full Synthetic Motor Oil will help if you want something affordable. This motor oil contains ingredients that will increase the performance of your vehicle. Moreover, friction-reducing compounds have been added to this motor oil to reduce friction between engine components. The formulation of Castrol GTX sets it apart from the other motor lubricants on this list. Furthermore, the molecules in this motor oil help to build an additional layer of protection for your automobile throughout the start-up and warming-up stages.

"Used this in all my vehicle the past 10 years with no issue"

by jesse kelley

Pennzoil Motor Oil is a cutting-edge proprietary mix that lubricates, cleans, and protects engines, preserving responsiveness and vitality. This Pennzoil contains Active Cleansing Agents, which help prevent sludge and other harmful deposits, clear up existing sludge in your engine, and provide proven wear protection. Furthermore, this motor oil contains a conventional base enhanced with their exclusive Active Cleansing Agents. Thus, this SAE 30W oil does better than others in clearing up existing deposits, preventing sludge, and stopping dangerous deposits in their tracks.

"This is an excellent conventional motor oil at a very reasonable price for a 5-quart jug. Pennzoil has a good reputation and has been around for a long time. I used to use their thicker 20W-50 in some of the old worn out V8 beaters I had as kid in the 70's and 80's."

by SJK