Oil Additives: Do They Work? Lucas, Permatex, and More

The oil additive category is full of bold claims — from restoring lost power to eliminating engine wear entirely. The reality is more nuanced. Here's an honest look at what additives can and can't do.

The Case For Oil Additives

Some additives have legitimate uses and measurable benefits:

ZDDP (Zinc/Phosphorus) Additives

Modern motor oils have reduced ZDDP content to protect catalytic converters. However, older engines with flat-tappet camshafts (pre-1990s) need higher ZDDP levels to prevent camshaft wear. Adding a ZDDP supplement is genuinely beneficial for these older engines.

Lucas Oil Stabilizer

For high-mileage engines with slight oil consumption or lifter noise, Lucas Stabilizer adds viscosity and anti-wear protection that can reduce noise and slow oil consumption. It's not a cure, but it can buy time on an aging engine.

The Case Against Most Additives

Modern full-synthetic motor oils are highly engineered with precisely calibrated additive packages. Adding random compounds can disrupt the balance — too much viscosity modifier, for example, can interfere with oil film strength.

The Bottom Line

• New engine under warranty: don't add anything, use manufacturer-specified oil
• High-mileage engine with noise or consumption: Lucas Stabilizer is a reasonable choice
• Flat-tappet classic engine: ZDDP supplement is genuinely necessary
• Skip the rest: most "miracle" additives are not supported by independent testing

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