CarCareTruth Score
Mediocre, but it's tough on the environment.
Priced as of June 10, 2026
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Prices may varyThe manufacturer's Safety Data Sheet classifies this product with one or more GHS Category 1 health hazards — the most severe tier. The hazard statements in quotes below are the verbatim GHS language from the SDS, as required by OSHA's Hazard Communication Standard. The line under each statement translates the GHS classification into plain language.
GHS Category 1 aspiration toxicity — thin, oily liquids can slip into the lungs if swallowed, causing chemical pneumonia.
If swallowed, inhaled, or splashed in eyes:
Call Poison Control immediately at 1-800-222-1222 (US, 24/7, free) and have the product container with you. Poison Control's standing guidance is to not induce vomiting after chemical exposure; they will direct first-aid steps based on the specific product.
About this product's hazards. This product's Safety Data Sheet uses signal word danger. Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate the manufacturer's safety sheet. They do not replace the SDS or substitute for a hazard assessment specific to your task.
This product ranks #6 of 6 in Fuel System Cleaner.Three above it ↓
Last reviewed June 10, 2026
TL;DR The Pro-Line 2030 is Liqui Moly's professional-grade gasoline system treatment, claiming injector, intake valve, and combustion chamber coverage in a single pour. The brand does not disclose the active chemistry publicly, so the multi-zone claim rests on brand reputation and a broad community track record rather than verified ingredient science.
This 500 ml concentrate treats 30 to 70 liters of fuel in one pour. Liqui Moly positions the 2030 as a broader, higher-concentration alternative to its consumer Jectron product, with explicit claims for injectors, intake valves, and combustion chamber carbon, including compatibility with both direct-injection and port-injection gasoline engines. The active detergent chemistry is not disclosed in the US safety data sheet; the performance claim rests on the brand's professional-market positioning and a large base of multi-vehicle owner reports. The recommended protocol covers both periodic maintenance and post-repair use.
Best fit for owners with port-injection or direct-injection gasoline engines experiencing rough idle, sluggish throttle, or carbon buildup symptoms who want a higher-concentrate treatment than the consumer Jectron. Skip it if the engine runs on Top Tier certified gasoline consistently, since the detergent package in Top Tier fuel handles deposit prevention. Also skip for diesel engines. Misfires or injector failures severe enough to trigger diagnostic codes need professional fuel system service, not a pour-in additive.
DANGER signal word on the SDS is driven by H304, the aspiration hazard classification: swallowing a petroleum concentrate and then vomiting risks lung injury. Do not induce vomiting if ingested, and seek medical attention. The isoparaffin carrier is low-volatility at the pour step; H336 narcotic effects apply in enclosed spaces. The product combusts in the engine and exhaust byproducts are the environmental endpoint.
The 2030 Pro-Line is a larger (500 ml vs. 300 ml) and higher-concentrate product positioned for professional use, with explicit coverage claims for direct-injection engines and combustion chambers. The Jectron is positioned for port-injection injector maintenance. Whether one outperforms the other depends on your engine type and what problem you're trying to solve. Neither discloses the active detergent chemistry in the US safety data sheet.
Yes. Liqui Moly explicitly states the 2030 Pro-Line is suitable for all gasoline injection systems, including direct-injection engines. This distinguishes it from the Jectron, which the brand positions for port-injection use.
The brand recommends adding one bottle at each inspection or annually for routine maintenance. It can also be used after fuel system repairs or when symptoms like rough idle or reduced throttle response appear. It is not intended as a fill-up-every-time additive.
Yes. The product carries a California Proposition 65 warning for naphthalene, a trace aromatic solvent component (less than 1% of the formula) confirmed as a Prop 65 listed carcinogen. This is consistent with most petroleum-solvent-based fuel additives sold in California.
The brand confirms compatibility with catalytic converters and gasoline particulate filters. Multiple owner accounts of use across vehicles with stock catalytic converters report no adverse effects.
Marketing copy from Liqui Moly, via Amazon. Not editorial.
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