I Investigated 7 US Diesel Truck Engine Oil Brands (Only 4 Are Worth Buying

We investigated 7 of the most popular diesel truck engine oil brands sold across the United States — and the results shocked us. Some of these oils are destroying engines from the inside while their marketing makes them look premium. We tested Shell Rotella T6, Mobil 1 Delvac, Valvoline Premium Blue, Pennzoil Platinum, Castrol Edge Professional, Lucas Oil Heavy Duty, and Royal Purple HMX. Only 4 actually protect your Cummins, Powerstroke, or Duramax the way they claim. The other 3 have serious questions surrounding their real-world performance that no one is talking about. If you own a diesel truck, this video could save your engine — and thousands of dollars in repair bills. #DieselTruckOil #EngineOilTest #DieselEngine #TruckMaintenance #BestDieselOil #WorstEngineOil #ShellRotella #MobilDelvac #RoyalPurple #LucasOil #Castrol #Pennzoil #Valvoline #CumminsTruck #PowerstrokeTruck #DuramaxTruck #TruckOwners #EngineProtection #DieselOilReview #OilBrandsRanked

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9 Synthetic Oils That Protect Your Engine (And 5 That Destroy It)
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9 Synthetic Oils That Protect Your Engine (And 5 That Destroy It)

I Investigated 7 US Diesel Truck Engine Oil Brands (Only 4 Are Worth Buying
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I Investigated 7 US Diesel Truck Engine Oil Brands (Only 4 Are Worth Buying

7 Engines Mechanics REFUSE to Work On (Ranked Bad to Catastrophic!)
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7 Engines Mechanics REFUSE to Work On (Ranked Bad to Catastrophic!)

I Investigated 7 US Pickup Truck Tool Box Brands (Only 3 Are Worth BuyingI bought and tested
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I Investigated 7 US Pickup Truck Tool Box Brands (Only 3 Are Worth BuyingI bought and tested

Is Amsoil Really the Best? We Put It To The Test!
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Is Amsoil Really the Best? We Put It To The Test!

5 Diesel Trucks That Last Forever (And the 3 That'll Bankrupt You)
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5 Diesel Trucks That Last Forever (And the 3 That'll Bankrupt You)

Does thin oil destroy modern engines? Rebuilder reveals the truth.
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Does thin oil destroy modern engines? Rebuilder reveals the truth.

Why U.S. Cars Use 0W-20 But the Same Engines Use 5W-30 Abroad (Mechanic Explains!) Secret Car Tricks
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Why U.S. Cars Use 0W-20 But the Same Engines Use 5W-30 Abroad (Mechanic Explains!) Secret Car Tricks

I Investigated 7 US Truck Engine Oil Brands (Only 2 Are Worth Buying
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I Investigated 7 US Truck Engine Oil Brands (Only 2 Are Worth Buying

Do Thin Oils Destroy Engines? Lessons From GM’s Massive Recall
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Do Thin Oils Destroy Engines? Lessons From GM’s Massive Recall

GM Is COLLAPSING — Americans Are Done Buying Their JUNK!
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GM Is COLLAPSING — Americans Are Done Buying Their JUNK!

I Investigated 7 US Pickup Truck Oil Filter Brands (Only 4 Are Worth Buying
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I Investigated 7 US Pickup Truck Oil Filter Brands (Only 4 Are Worth Buying

7 Diesels Plummeting in Price RIGHT NOW (Grab Them Before They're Gone)
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7 Diesels Plummeting in Price RIGHT NOW (Grab Them Before They're Gone)

THIS Is The TRUTH About Diesel Additives...
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THIS Is The TRUTH About Diesel Additives...

Unbelievable Smart Worker & Hilarious Fails | Construction Compilation #7 #adamrose #smartworkers
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Unbelievable Smart Worker & Hilarious Fails | Construction Compilation #7 #adamrose #smartworkers

The Fendt Destroyed His Deere on Fuel Economy — Then AGCO's Warranty Saved His Harvest
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The Fendt Destroyed His Deere on Fuel Economy — Then AGCO's Warranty Saved His Harvest

Nobody Wants These $80,000 Pickup Trucks — Here's Why
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Nobody Wants These $80,000 Pickup Trucks — Here's Why

NEVER Use 32 PSI — Stop Falling For The Tire Industry’s $1,000 Trap
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NEVER Use 32 PSI — Stop Falling For The Tire Industry’s $1,000 Trap

THESE 15 MOTORCYCLES ARE NOW WORTHLESS IN 2026 - HERE IS WHY!
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THESE 15 MOTORCYCLES ARE NOW WORTHLESS IN 2026 - HERE IS WHY!

How Is Mercury Made? THE SILVER LIQUID HIDDEN INSIDE RED STONE
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How Is Mercury Made? THE SILVER LIQUID HIDDEN INSIDE RED STONE