It’s an engine performance restoration additive that’s used right before an oil change. The goal is to help loosen and suspend sludge, varnish, and other deposits so they drain out with the old oil.

• When it’s used: Typically just prior to draining engine oil as part of a maintenance service.
• Why people use it: To support cleaner internal engine surfaces and help fresh oil circulate more freely.
• Good to know: Always follow the product label and your vehicle’s manual. These additives aren’t a fix for mechanical issues, and results can vary with engine condition and maintenance history.

Always follow the specific timing on the product label, since directions vary by formula and engine design. These cleaners are generally intended for short use just before an oil change, not for an entire oil interval.

• Typical approach: Add before service, run the engine as directed, then drain the oil and replace the filter.
• Avoid overfilling: Check oil capacity so the crankcase isn’t overfilled when adding any cleaner.
• Play it safe: If you’re unsure, consult a professional technician or your owner’s manual. Conditions like heavy sludge or prior engine issues may require a more cautious approach.

It can be helpful for some vehicles as a maintenance step, but whether it’s worth trying depends on your engine’s condition and service history.

• May be helpful if: You suspect deposit buildup, have irregular oil change history, or want to clean internal surfaces before fresh oil.
• Might not be needed if: You’ve kept up with timely oil changes and your engine is running smoothly.
• Keep in mind: These products don’t fix mechanical problems, and outcomes vary. Consider your mileage, driving habits, and maintenance records. When in doubt, ask a trusted technician for guidance.

You can shop a variety of engine performance restoration additives on Walmart.com, with options for shipping, delivery, or store pickup depending on your location.

• Check availability: Use the product page to see local store stock and pickup times.
• Browse options: You’ll find single cans, multi-packs, and kits tailored to different maintenance needs.
• Helpful tip: Confirm compatibility with your vehicle using the product description and your owner’s manual. Availability can vary by store and region, so online inventory and fulfillment options are the most up-to-date.

Many crankcase cleaners are designed to work with both conventional and synthetic oils, but you should always verify the label for your specific product and engine.

• Before you add it: Check your oil capacity so you don’t overfill the crankcase.
• When to use: These are typically added just before an oil change and then drained out with the old oil.
• Compatibility check: Review your owner’s manual and avoid mixing multiple additives unless directed by the product instructions. If you’re unsure, a professional technician can help you decide what’s appropriate.