Don't Waste Your Time: The Truth About Grease and Engine Oil

You’ve been in the woods, the truck is dead, and the oil pan is bone dry. Your pantry, however, is stocked with rendered bacon fat. Suddenly, that old piece of folklore about using animal grease to get the motor running seems less like a myth and more like a life-or-death strategy. It’s the kind of desperate, 'MacGyver' scenario that makes for great campfire stories, but when it comes to a modern engine, those stories are dangerous.

We’ve all seen the viral videos—the kind that make you pause and think, 'Wait, seriously?' The question is: Does bacon grease actually make decent engine oil? Our shop tested the myth head-on, comparing the performance of standard 10W-30 synthetic motor oil against rendered bacon grease across lubricity, temperature stability, and overall engine health.

The Myth: Bacon Grease vs. Motor Oil

It’s easy to look at grease and think, 'It’s fat. Fat lubricates.' The concept seems simple enough for a roadside fix. But engines aren't just about slick surfaces; they are complex combustion systems that require specific chemical properties to function reliably. We ran the comparison on a lubricity tester, comparing the film strength of the two substances side-by-side. While the initial results were surprisingly good—the bacon grease showed impressive film strength on the bearing—the story gets complicated when we push the engine.

Beyond Lubricity: The Real Stress Test

Lubricity is just one metric. A proper oil needs to maintain viscosity under extreme heat, withstand combustion byproducts, and keep your crankcase and cylinder head protected. For this round, we ran the engine for a full 30 minutes, monitoring the crankcase and cylinder head temperatures with both oils. We also performed a full compression test and then drained the oil to see what the final product looked like.

The results were clear. While bacon grease might *look* impressive in a controlled, cool-down test, it fails to meet the rigorous demands of a modern motor. The chemical breakdown, the particulate matter, and the inability to properly filter the byproducts make it a hazard, not a solution.

Master Mechanic Word-of-Mouth

The lesson here is that while DIY spirit and resourcefulness are what make the gearhead community so awesome, when dealing with core engine components—the pistons, the rings, the bearings, the timing chain—you have to trust the science, not the pantry. Using the wrong fluid doesn't just cause a temporary sputter; it can lead to catastrophic engine failure, turning your weekend warrior project car into an expensive paperweight.

Pro Tip: Getting Started When the Motor Dies

Speaking of starting motors, the video also touched on a common garage dilemma: getting a lawnmower started without a proper pull cord. The socket adapter method using a drill can certainly get the job done, but it requires finesse. Remember, the size of the nut varies wildly from unit to unit, so don't assume a universal fit. It’s a good reminder that even small, simple mechanical tasks require specific knowledge and the right tools.

Ultimately, whether you're swapping an LS into a classic muscle car or just trying to get a lawnmower running, the best defense against mechanical failure is preparation. Keep your proper fluids stocked, and always consult a Master Mechanic when the problem goes beyond a simple oil change.

Got a project car sitting in the garage that needs a serious tune-up, or maybe you're ready to tackle a full resto-mod? Don't wait for a grease emergency to teach you a valuable lesson. Find a Master Mechanic near you, list that project car, or book a CrownRunner service today to get back to the grease.