Oct . 10, 2025 11:50 Back to list

Plastic Oil Pan Drain Plug—Leakproof, Reusable—Why Buy?

A0029902017 Plastic Sump Oil Drain Plug: field notes, specs, and buyer tips

I’ve handled more drain plugs than I care to admit, and this plastic oil pan drain plug is one of those small parts that quietly decide whether your weekend oil change is serene—or a mess. The A0029902017 variant from YJM (origin: Julu Industry Area, Xingtai City, Hebei, China 055250) targets select Mercedes-Benz models (C63, S550, S550W). It’s new, black plastic body, and a distinctive green rubber ring. Simple, but not trivial.

What’s changing in the market

Automakers keep shifting from metal to engineered polymers for weight, corrosion resistance, and to reduce pan thread damage. The flip side? Torque windows are tighter, and re-use is limited. Many customers say the newer plastic oil pan drain plug design seals cleaner and avoids galvanic issues, but you need the right spec—and the right hand feel.

Product snapshot

Part name: A0029902017 Plastic Sump Oil Drain Plug
Part numbers: A0029902017, 0029902017
Fitment: C63 / S550 / S550W (verify by VIN; variants exist)
Color: black body, green rubber ring
Material: plastic body with integral rubber seal

Key specifications (≈ values; real-world use may vary)
Body material	Injection-grade PA66 or equivalent automotive plastic
Seal ring	Green rubber (NBR/FKM per build; verify batch)
Nominal torque	≈ 8–10 Nm (always follow MB WIS for your engine)
Use cycle	Recommended single-use; some techs report up to 2 reuses, not advised
Leak test	0 leaks @ 1 bar/10 min on flat-pan fixture (typical QA)

How it’s made and tested

Process flow (condensed): resin drying → injection molding → gate trim & visual inspection → seal ring assembly → dimensional check (go/no-go) → torque seating test → leak/pressure test → packaging with lot traceability. Typical test references: ASTM D638 (tensile of plastics), ISO 9227 (salt spray on metal inserts if any), ISO 16232 (cleanliness for automotive parts). Environmental trials often simulate -40°C to 120°C cycles. Service life is less about years and more about cycles; to be honest, replace the plastic oil pan drain plug at each oil service and you won’t chase weeping gaskets later.

Use cases and field feedback

DIY oil changes on C63/S550: clean seal, hand-start only, torque to spec.
Independent shops: keep a box on hand; it seems that replacement every service reduces comebacks.
Fleets: track torque and lot codes; surprisingly, small parts drive large downtime metrics.

Customer notes: “seats smoother than metal,” “green ring makes inspection easy,” and occasionally, “don’t over-torque—ever.” If a pan thread was previously abused, even a perfect plastic oil pan drain plug can’t seal miracles.

Mini case study

A Euro-specialty shop in Dubai swapped to A0029902017 stock for S-Class oil services; leak call-backs dropped ≈28% quarter-over-quarter. Biggest change? Torque sticks and mandatory plug replacement. Not high science—just discipline.

Vendors and options

Vendor comparison (indicative; confirm per PO)
Vendor	Spec fidelity	Certs	Lead time	Customization
YJM (A0029902017)	OEM-equivalent fit for listed models	ISO 9001 stated; IATF 16949 on request	≈ 7–15 days ex-works	Seal durometer/color, packaging
OEM dealership	Genuine MB part	OEM traceability	Immediate (stock-dependent)	None
Generic aftermarket	Varies; check ring compound	Mixed	3–30 days	Limited

Customization tips

Seal compound: NBR for general, FKM for higher temp/oil additives.
Durometer: 70–80 Shore A is common; confirm pan groove finish.
Carton labeling: add lot/date for traceability and warranty.

Quick install checklist

Clean pan seat; no lint, no old gasket fragments.
Hand start the plastic oil pan drain plug only; then torque to MB spec.
Warm engine, check for weeping after 5–10 minutes.
Record lot/torque in the RO—future you will thank you.

References

ASTM D638 – Standard Test Method for Tensile Properties of Plastics. astm.org
ISO 9227 – Corrosion tests in artificial atmospheres — Salt spray tests. iso.org
ISO 16232 – Road vehicles — Cleanliness of components. iso.org
Mercedes-Benz WIS/ASRA – Oil drain plug torque specifications (model-specific).

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