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Mediocre.
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Prices may varyThis product ranks #24 of 24 in Motor Oil.Three above it ↓
Last reviewed June 7, 2026
TL;DR Certified to API SN and ACEA A3/B4, covering MB 229.5, Porsche A40, VW 502 00/505 00, and BMW Longlife-01 (pre-2018) OEM approvals, but not the API SP spec required by most 2020+ North American engines. The MFC friction modifier technology (tungsten and molybdenum) is genuinely distinctive.
Molygen New Generation 5W-40 is a fully synthetic motor oil built around MFC (Molecular Friction Control) technology: tungsten and molybdenum compounds that form a friction-reducing layer on engine surfaces and give the oil its fluorescent green color. It meets ACEA A3/B4 with MB 229.5, Porsche A40, VW 502 00/505 00, BMW Longlife-01 (pre-2018 LL-01), and Renault RN 0700/0710 approvals. API SN was superseded by API SP in 2020; the 5W-40 grade remains on SN as of 2026. Drain intervals follow OEM specification, no extended drain claim is made, and no independent community used-oil analysis data for Molygen 5W-40 was found to confirm or contradict real-world interval performance. The oil is well-reviewed by owners with broad community support in European-car communities.
Best for European vehicles including BMW, Mercedes, Porsche, VW/Audi, Renault, and Fiat where ACEA A3/B4 and specific OEM approvals matter. Skip it for any 2020+ vehicle requiring API SP, where a current-spec oil better protects modern GDI engines. Also skip it if your BMW requires LL-04, LL-14 FE+, or LL-17 FE, as this oil covers only LL-01 (up to 2018).
SDS §2 carries signal word WARNING with H336 (narcotic/CNS effects at occupational concentrations, not relevant at ambient temperature during a normal oil change) and H402 (harmful to aquatic life). The H304 aspiration hazard does not apply, since the oil's viscosity is well above the threshold for that classification. The manufacturer's product page carries a California Proposition 65 warning for a listed aromatic impurity (cancer category) found in the petroleum base stock. Gloves are a sensible precaution during prolonged or repeated contact during draining; splash protection for eyes during pouring is reasonable given the physical mechanics. Used oil goes to a collection facility, not down the drain or on the ground.
Molygen 5W-40 carries MB 229.5 (older Mercedes-Benz passenger cars), BMW Longlife-01 (pre-2018 BMW models that specified LL-01, not LL-04 or LL-17 FE), Porsche A40, and VW 502 00/505 00 approvals. If your BMW was manufactured after 2018 or requires LL-04, LL-14 FE+, or LL-17 FE specification, this oil does not meet that requirement. Check your owner's manual for the exact OEM approval code required.
MFC stands for Molecular Friction Control, a proprietary Liqui Moly additive technology based on tungsten and molybdenum compounds. These molecules form a protective layer on metal surfaces to reduce friction losses. The tungstate compounds have naturally fluorescent properties when excited by UV light, which also enables UV leak detection after an oil change. The green color is the tungstate additive, not a dye.
No. Molygen 5W-40 is certified to API SN, which was superseded by API SP in 2020. API SP adds improved deposit control, oxidation stability, and chain wear protection for engines with GDI (gasoline direct injection) and turbochargers. Owners of 2020+ vehicles with API SP requirements should confirm with their dealer before using this oil. Molygen 5W-40 is best suited to vehicles that specify ACEA A3/B4 with the listed OEM approvals.
Liqui Moly's product guidance advises against mixing Molygen with additional friction-modifier additives such as Cera Tec or MoS2. The MFC additive package is already formulated into the oil, and adding external friction modifiers could affect the additive balance and potentially void performance claims.
Liqui Moly's product page carries a California Proposition 65 warning for naphthalene, a polycyclic aromatic hydrocarbon that the state of California identifies as a known carcinogen. This warning applies to the oil as sold and reflects the composition of the petroleum-base stock. The warning is relevant to routine handling during oil changes (skin contact, inhalation of vapor at elevated temperatures). Used oil also carries used-oil-specific hazards unrelated to this classification.
Marketing copy from Liqui Moly, via Amazon. Not editorial.
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