Auto & Tools · Prolube

Prolube Engine Oil Treatment

An oil additive you pour in with your motor oil, marketed to cut friction and quiet a noisy engine.

Added directly to the crankcase with your existing motor oil at oil-change time.
Marketed to reduce friction and wear on internal engine components.
Sold direct by Prolube and through online marketplaces.

$38.99

On Amazon when we checked (June 16, 2026) — live price may differ.

By Patrick Smith · Updated July 11, 2026 · How we review · We may earn a commission from Amazon links.

Price when checked: $38.99; on Amazon, June 16, 2026
Sources cited: 1; independent source

Our verdict

Hard to recommend over simply buying a quality oil, given the absence of independent user results. If you're set on an additive, products with long forum track records have far more documented feedback.

Prolube Engine Oil Treatment sells a familiar promise — pour a bottle into your crankcase, get less friction and a quieter engine — in a product category that enthusiast communities treat with more suspicion than almost any other. What stands out when you go looking for real-world results is how little there is. On owner forums, threads asking about Prolube get answered with recommendations for other, better-documented additives; in one discussion a member noted that a large share of the formula is undisclosed on its safety documentation and suggested running an oil analysis before and after if you're curious. Meanwhile modern engine oils already carry complete additive packages from the blender. At $38.99 a bottle, that's a lot to pay to be the test case.

Frequently asked questions

Does Prolube actually reduce engine wear?

The claims are the manufacturer's own. We found no independent published testing and essentially no verified owner reports; forum users who discussed it suggested before-and-after used-oil analysis as the only way to know.

Is adding an oil treatment safe for my engine?

Modern motor oils are blended with a balanced additive package, and pouring in an aftermarket treatment changes that chemistry. Check your owner's manual and warranty terms — some manufacturers discourage supplemental additives.

How is it used?

Like most oil treatments, it's poured into the crankcase alongside your motor oil, typically at an oil change, per the bottle's dosing instructions.