Parts for your 2017 Holden Astra-Sump plug washers

2017 Holden Astra sump plug washers — do you need one?

Short answer: yes, the 2017 Holden Astra uses a sealing element at the sump plug — either a traditional crush washer or an integrated seal — depending on the exact variant. Technical sources including Holden/GM Global Service Information (GSI) for BK/BL Astra, Opel/Vauxhall TIS for Astra K, and ACDelco/major parts catalogues note that BK hatch models (1.4T/1.6T) use a separate aluminium crush washer on the M14 oil drain plug, while the BL sedan (built by GM Korea, 1.4T LE2) commonly uses a drain plug with a captive rubber/nylon O‑ring seal. So, for BK hatch owners, a sump plug washer is a normal service item, for BL sedan owners, the sealing ring is built into the plug and the plug (or its O‑ring) is replaced if damaged or per service guidance.

What does the washer actually do? On BK hatch engines, the aluminium crush washer deforms slightly as the plug is torqued, sealing the plug against the sump face to keep oil where it belongs. It’s a cheap part that prevents weeping, seepage and overtightening. On BL sedan engines with an integrated O‑ring plug, the function’s the same — the washer is just moulded onto the plug instead of being a separate ring.

Best practice at service time is simple: replace the crush washer every oil change on BK hatch models. It’s designed for one-time use, reusing it can lead to slow leaks, messy undertrays, and the temptation to over-tighten the plug. If you’ve got the BL sedan with the captive O‑ring style plug, inspect the O‑ring for nicks, flattening or hardening, replace the plug (or the seal, if available separately) if there’s any doubt. Workshop literature specifies tightening the drain plug to the published spec in the service manual for your engine — typically in the mid‑20s to ~30 Nm range for an M14 plug. Don’t guess, over‑torque can strip threads, under‑torque can seep.

Quick tips that pay off:

• Match the washer type and size to your engine by VIN/engine code (BK hatch = separate crush washer, BL sedan = captive seal).
• Never double up washers or mix copper and aluminium on the same plug face.
• Clean the mating surface, hand‑start the plug, then torque to spec on a cool sump.
• Run the engine, check for drips, and recheck after a short drive.

These recommendations align with Holden/GM GSI procedures and Opel TIS notes for Astra K engines, along with ACDelco and major AU/NZ parts listings that specify a replaceable crush washer for BK hatch variants and an integrated-seal plug for the BL sedan.

What size washer does a 2017 Holden Astra use?

Most BK hatch engines use an M14 crush washer. The BL sedan often uses a plug with a built‑in O‑ring instead of a separate washer. Always confirm by VIN or engine code when ordering, as there are engine/plant differences across the 2017 range.

Should the sump plug washer be replaced every oil change?

For BK hatch models with a separate crush washer — yes, replace it every time. For BL sedan models with a captive O‑ring plug, inspect the seal each service and replace the plug if the O‑ring shows damage or hardening.

What torque should the sump plug be tightened to?

Use the figure in the Holden/GM service manual for your specific engine. As a guide, M14 plugs are commonly in the mid‑20s to ~30 Nm range. Avoid overtightening — let the crush washer or O‑ring do the sealing.