Consider engine flush products only if your vehicle manual permits a crankcase flush and there is a reason to clean the oil system. For routine service, use the specified oil and a new filter at the recommended interval. Diagnose low oil pressure, heavy sludge or a warning light before adding a cleaner.
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Engine flush products and label procedures
| Product | Verified label details | Use and limits |
|---|---|---|
| LIQUI MOLY Pro-Line Engine Flush 2037 | 500 mL. Maker lists 3–5 L of oil for one full can. | Add before the oil change and idle 10–15 minutes per directions. |
| Sea Foam Motor Treatment SF-16 | 16 fl oz per can. Linked listing describes a two-pack. | Maker’s crankcase directions specify 1 fl oz per US qt of oil, 100–300 miles before the change. |
| Lubegard Engine Flush 95030 | 15 fl oz | Manufacturer lists 10–15 minutes at idle without a flush machine. |
| STP Super Concentrated High Mileage Engine Flush | 15 fl oz | Maker directs 5–15 minutes at idle and prohibits driving with it in the oil. |
| BG EPR Engine Performance Restoration 109 | 11 fl oz for part 109. Separate 32-fl-oz version. | Procedure depends on engine type and sump capacity. Manufacturer excludes excessive sludge. |
| Hapco Fast Motor Flush | 16 fl oz per retailer | Confirm the exact label, dose and run time before use. |
| XADO ATOMEX Total Flush XA 40613 | 250 mL. Maker lists 4–5 US qt of oil. | Maker gives different use procedures for routine and other applications. |
Product listings
- LIQUI MOLY Pro-Line Engine Flush 2037 Check Amazon availability
- Sea Foam Motor Treatment SF-16 Check Amazon availability
- Lubegard Engine Flush 95030 Check Amazon availability
- STP Super Concentrated High Mileage Engine Flush Check Amazon availability
- BG EPR Engine Performance Restoration 109 Check Amazon availability
- Hapco Fast Motor Flush Check Amazon availability
- XADO ATOMEX Total Flush XA 40613 Check Amazon availability
Decide whether a flush makes sense
Read the vehicle’s oil maintenance instructions. Some manuals advise against crankcase flushing. The Chevrolet Impala Limited manual is one example. If your manual advises against it, use the regular oil and filter service it specifies.
Low oil pressure, heavy sludge, unusual noise or a warning light calls for diagnosis. A shop can inspect the oil pickup and related components and decide whether mechanical cleaning or repair is needed. An additive label does not identify the cause of oil pressure loss.
Check the procedure before opening the bottle
- Match the exact formula, engine type and oil capacity. Verify any wet-clutch or other exclusions.
- Read the label’s oil-temperature, engine-speed and timing directions. Measure the dose, account for its volume and avoid overfilling. Stay with the vehicle during an idle procedure in a well-ventilated place.
- Drain when directed, install the correct filter, refill with the specified oil and check the final oil level. Follow the manufacturer’s requirements for disposal.
For normal service, use the motor oil specification guide, oil filter fitment guide or diesel engine oil guide.
LIQUI MOLY Pro-Line Engine Flush 2037
The manufacturer gives an idle-only procedure followed by an oil and filter change. Check its exclusions, including motorcycles with wet clutches.
Sea Foam Motor Treatment SF-16
Follow the Sea Foam crankcase directions and check the delivered pack quantity. This is a separate procedure from adding SF-16 to the fuel tank.
Lubegard Engine Flush 95030
Lubegard says to check the oil level, add the flush to warm oil and idle before draining. Use the exact label and the vehicle manual for allowable sump capacity and application.
STP Super Concentrated High Mileage Engine Flush
The STP directions call for draining the crankcase and replacing the oil and filter after the idle procedure.
BG EPR Engine Performance Restoration 109
See the BG application chart for the correct dose, time and engine speed. Some GDI and light-duty diesels have different times. Confirm the procedure with the servicing shop.
Hapco Fast Motor Flush
The retailer identifies the linked 16-fl-oz product. A current manufacturer procedure for this exact bottle could not be verified. Ask for the label before choosing it.
XADO ATOMEX Total Flush XA 40613
The XADO directions list 10–15 minutes at idle or a short drive for their routine procedure. Follow the exact label and vehicle manual. The retailer matches the linked ASIN to XA 40613.
FAQ
Should I flush an engine at every oil change?
Follow the vehicle’s maintenance schedule and oil specification. Consider a flush only if its procedure is allowed and there is a reason to clean the crankcase.
Can I drive with engine flush in the oil?
Follow the exact label and vehicle manual. STP specifies idle only and prohibits driving. Sea Foam has separate crankcase directions for use before a scheduled oil change.
Can a flush fix low oil pressure?
Low oil pressure can have several causes and needs diagnosis. Follow the vehicle’s warning-light instructions and have the oil system checked.
Should I replace the oil filter after an engine flush?
Follow the exact procedure. The immediate-drain flushes in this comparison call for replacing the oil and filter after treatment.
Can I use a flush in an engine with a wet clutch?
Check the equipment manual and product label. LIQUI MOLY excludes motorcycles with wet clutches for Pro-Line Engine Flush.
Product photos and listings
| Product | Photo and listing |
|---|---|
| LIQUI MOLY Pro-Line Engine Flush 2037 | Check Amazon availability |
| Sea Foam Motor Treatment SF-16 | Check Amazon availability |
| Lubegard Engine Flush 95030 | Check Amazon availability |
| STP Super Concentrated High Mileage Engine Flush | Check Amazon availability |
| BG EPR Engine Performance Restoration 109 | Check Amazon availability |
| Hapco Fast Motor Flush | Check Amazon availability |
| XADO ATOMEX Total Flush XA 40613 | Check Amazon availability |
Sources checked on November 11, 2026.
