MK4 Golf / Jetta / GTI / GLI Oil Change Kit — Liqui Moly Molygen 5W-40 | 1.8T & 2.0L
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Mk4 · 1.8T & 2.0L · Oil Service
Mk4 Oil Kit
Liqui Moly
Molygen 5W-40
5 Liters Full Synthetic · MFC Additive · OE-Spec Filter
The step up for a Mk4 that sees boost, heat, or a tune. Molygen New Generation holds the same VW 502 00 / 505 00 approval as the standard oil, then layers Liqui Moly's MFC — Molecular Friction Control — tungsten additive on top of it. Higher TBN, a deposit-fighting friction package, and the fluorescent green dye that makes chasing seeps on a twenty-year-old motor genuinely easy under a UV light.
Mk4 · Oil Change Kit
Liqui Moly Molygen 5W-40
Why This Oil
MFC, and what it actually does.
Molygen's headline is Molecular Friction Control — a tungsten-based additive that plates onto sliding surfaces and keeps deposits from forming while cutting frictional losses. On a Mk4 1.8T that's been chipped, sees track days, or has 180k on the clock, that additive package is the reason to spend the extra over a standard 5W-40. Same VW approval, more protection behind it.
What's Included
Everything for the change.
| Qty | Part | Brand |
|---|---|---|
| 1 | 5 Liter of 5W-40 LIQUI MOLY Molygen fully synthetic oil | Liqui Moly |
| 1 | Oil Filter | MANN, Mahle, or OEM VW/Audi |
| 1 | Crush Washer | OE Supplier |
Mk4 1.8T and 2.0L 8V both run a spin-on filter (OE 06A115561B, or the larger 068115561B per VW/Audi TSB 04-01 on the 1.8T). The 5-liter jug covers a full service fill on either engine with a little left over for top-ups — always finish on the dipstick, not the bottle.
Technical Data
Molygen New Generation 5W-40.
Figures below are from the current Liqui Moly product information sheet. Nothing rounded, nothing marketing-massaged.
| SAE Grade | 5W-40 |
| Base Oil | Fully Synthetic |
| Density @ 15 °C | 0.850 g/cm³ |
| Viscosity @ 40 °C | 90.0 mm²/s |
| Viscosity @ 100 °C | 14.5 mm²/s |
| Viscosity Index | 170 |
| HTHS @ 150 °C | ≥ 3.5 mPa·s |
| CCS @ −30 °C | ≤ 6600 mPa·s |
| MRV @ −35 °C | < 60000 mPa·s |
| Pour Point | −39 °C (−38 °F) |
| Flash Point | 220 °C (428 °F) |
| Noack Evap. Loss | 10.0 % |
| Total Base Number | 11.3 mg KOH/g |
| Colour | Fluorescent Green |
Sulphated ash 1.0–1.6 g/100 g. Approvals listed are the manufacturer approvals held by the oil itself. Always follow the service spec in your owner's manual.
Molygen vs Leichtlauf
Which one do you want?
Both carry the same VW 502 00 / 505 00 approval and both are correct for your Mk4. The difference is the additive package — and what you're asking the engine to do.
Molygen New Generation 5W-40
MFC tungsten friction-control additive, higher TBN at 11.3, and the fluorescent green UV dye. The pick for a chipped or turbo-upgraded 1.8T, a car that sees track time, or a high-mileage motor you're actively chasing leaks on.
Leichtlauf High Tech 5W-40
The sensible default for a stock or lightly modified Mk4 on normal street miles. Same VW approval, slightly higher viscosity index at 180 and a higher flash point, without the MFC package. Best value per change.
Fitment
Will it fit?
| Model | Years | Fitment |
|---|---|---|
| VW Mk4 Golf / GTI 1.8T (AWD / AWW / AWP / ATC) | 2000–2006 | Direct Fit |
| VW Mk4 Jetta / GLI 1.8T | 2000–2005 | Direct Fit |
| VW Mk4 Golf / Jetta 2.0L 8V (AEG / AVH / AZG / BEV) | 2000–2006 | Direct Fit |
| VW Mk4 GTI 337 / 20th Anniversary 1.8T | 2002–2003 | Direct Fit |
| VW New Beetle 1.8T / 2.0L | 2000–2005 | Direct Fit |
| VW Mk4 Golf / Jetta 1.9 TDI | 2000–2006 | Not Compatible |
| VW Mk4 Golf R32 3.2 VR6 / Jetta 2.8 VR6 | 2000–2004 | Separate Kit |
Covers the 1.8T 20V and 2.0L 8V gasoline engines across the Mk4 chassis. If you're unsure which engine code you have, email us your VIN and we'll confirm before you order.
Ready for service?
Mk4 Oil Kit
Molygen 5W-40
5 Liters Full Synthetic · MFC Additive · OE-Spec Filter