Marcus RodriguezDiesel fuel additives5 products
If you want pure injector cleaning, the Liqui Moly 2509 is the gold standard for most drivers. For a deep professional-grade clean, go with the Wynn's 76401, while the budget-conscious should stick to the standard Liqui Moly 8343.
Budget maintenance
Daily drivers
Frequent cleaning
Heavy-duty restoration
Total system cleanup
| Feature | Liqui Moly 8343 | Liqui Moly 2509 | Wynn's 18073 | Wynn's 76401 | Goodyear 5-in-1 |
|---|---|---|---|---|---|
| Price | €15.00 | €17.50 | €8.99 | €23.29 | €12.95 |
| Targeted CleaningThe Goodyear 5-in-1 covers the widest range of components beyond just the injectors. | System wide | Injectors & combustion chamber | Injectors & fuel system | Deep system treatment | 5-in-1 (Turbo, DPF, EGR, etc) (winner) |
| VolumeThe Liqui Moly 2509 and Wynn's 76401 give you the most bang for your buck in volume. | 250 ml | 500 ml (winner) | 325 ml | 500 ml | 300 ml |
| CompatibilityLiqui Moly 2509 explicitly handles the DPF concern, which is vital for modern diesels. | Universal | Diesel w/ or w/o DPF (winner) | Up to B30 | Universal | Advanced systems |
Budget maintenance
A solid, no-nonsense additive for basic fuel system upkeep. It won't perform miracles but keeps things running clean.
Daily drivers
This is my go-to for keeping injectors firing cleanly. It does exactly what it says on the tin without any gimmicks.
Frequent cleaning
An affordable option that gets the job done for regular maintenance. It is an honest cleaner that doesn't overpromise.
Heavy-duty restoration
When your engine feels sluggish, this premium treatment brings out the big guns. It is professional grade for a reason.
Total system cleanup
This one targets the whole alphabet of diesel issues, from EGR to DPF. It is the Swiss Army knife of additives.
If you are looking at these, your engine is likely feeling a bit like a Sunday morning after a Saturday night out. You need to clear the pipes. The Liqui Moly options are the reliable workhorses here. The 2509 is more concentrated and better for engines that have seen a few miles, while the 8343 is your light-duty maintenance additive.
Wynn's offers a similar split. The 18073 is your basic, affordable cleaner, but if you want to fix a specific performance drop, the 76401 is the one I reach for in the shop. Then there is the Goodyear 5-in-1. It is a newer player that tries to solve everything at once. It is great if you have a modern car with a complex exhaust system, but don't expect it to replace a proper mechanical rebuild if your turbo is actually toasted.
Here is the deal: these cleaners can strip away carbon and help your spray pattern, but they aren't going to fix a cracked injector or a blown gasket. If your engine is running rough, these are a cheap first step before you start pulling parts off. Always pour them into a near-empty tank before you fill up to ensure they mix properly. If you just dump them in after filling, you are relying on the sloshing of the road to do the mixing for you, and that is just amateur hour.
If you want the best all-rounder, go for the Liqui Moly 2509. It is proven, effective, and won't let you down. If your car is showing serious signs of soot buildup across the board, grab the Goodyear 5-in-1 to clean the whole system at once.
For those just wanting to keep things cheap and cheerful, the Wynn's 18073 is hard to beat for the price. Just remember, keep up with your filter changes too, because no additive can clean a clogged fuel filter.
Prices on amazon.es as of October 16, 2026. Prices may change.
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