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2018 Porsche Boxster S oil capacity, type & filter

The 2018 Porsche Boxster S takes 6 qt of 0W-40 oil.

Applies to checked engine: 2.5L. Also check 2018 Porsche Boxster .

Capacity 6 qt i Based on 1 checked source: Pennzoil OATS. Additional cross-check is still pending: a second checked capacity source and capacity condition (service fill / with filter vs dry fill). Use it as a reference, then confirm the service-fill / with-filter amount before adding oil. See how we verify. Learn how we verify fitment
Oil type 0W-40 i Based on 1 checked source: Pennzoil OATS. Additional cross-check is still pending: a second checked oil-type source and agreement across all checked oil-type sources. Use it as a reference, then confirm the viscosity grade for this engine before checkout. See how we verify. Learn how we verify fitment OEM oil approval is not source-backed on this page; confirm the bottle or owner's manual before checkout.
Oil Filters
No checked filter listed Use a retailer fitment tool to confirm the exact part number before ordering.

2 sources checked Last checked: 2026-06-27 How we verify →

Where to Buy View Data Sources
Buy oil & filters:
Walmart → AutoZone → Amazon → O'Reilly →
Full synthetic options for 0W-40
Mobil 1 0W-40 → Castrol Edge 0W-40 → Liqui Moly Leichtlauf 0W-40 →

Search paths only — confirm your OEM viscosity spec and quantity before checkout.

2018 Porsche Boxster S oil specs: capacity conditions and filter notes

Filter status

Filter fitment has not been fully verified for every engine listed. Confirm the part number with the retailer before ordering.

Verify before checkout

Retailer fitment tools may use different data. Confirm oil capacity, viscosity, and filter part number before ordering.

Source coverage for the 2018 Porsche Boxster S

Capacity sources

Supported by Pennzoil OATS.

Oil type sources

Supported by Pennzoil OATS.

Filter sources

Filter support not listed on this page.

Source coverage

2 checked source rows for the 2018 Porsche Boxster S.

Before ordering for this 2018 Porsche Boxster S

Checkout verification checklist
2.5L Buy →
Capacity
6 qt
Oil type
0W-40
Interval
10,000 mi / 12 mo
Filter
Unverified

Source check: Last checked 2026-06-27 from Pennzoil OATS and Castrol (Olyslager).

Same oil specs on other 2018 Porsche models

Boxster GTS, Cayman GTS, Cayman S

Porsche Boxster S oil specs by year

This table includes checked Porsche Boxster S model years available in our database.

Year Capacity Oil type Filter
2019 9 qt 0W-40 Unverified
2018 Current page 6 qt 0W-40 Unverified
2017 6 qt 0W-40 Unverified

How we verified 2018 Porsche Boxster S oil data

How we verify fitment

Checked fitment data. Last checked: 2026-06-27.

This page checked 2 sources for the 2018 Porsche Boxster S. The table lists which checked source contributed capacity, oil type, or filter evidence.

We checked leading oil brands and aftermarket filter catalogs so you don't have to.

Confidence
Cross-check pending i Some oil fields are based on checked source data but still need stronger cross-check evidence. Review area: 2.5L capacity and 2.5L oil type. Use the listed values as references and confirm the exact engine before ordering or adding oil. See how we verify. Learn how we verify fitment
Sources checked
2
Last checked
2026-06-27
Field-level source support
  • Capacity: Pennzoil OATS
  • Oil type: Pennzoil OATS
  • Filter: Support not listed on this page
  • Change interval: Pennzoil OATS
Source Supports Checked Link
Pennzoil OATS Capacity, Oil type 2026-06-27 Visit brand site
Castrol (Olyslager) Checked 2026-06-27 Visit brand site

2018 Porsche Boxster S oil FAQ

Is the oil capacity measured with or without the filter?

Capacity condition matters. With filter includes a new filter. Service fill is the typical drain-and-fill amount. Dry fill is for a fresh empty engine only.

Why should I confirm before buying?

Retailer catalogs can update separately. Confirm the exact 2018 Porsche Boxster S selector at checkout before you buy.

Do I also need to match the OEM oil approval?

Yes. Viscosity is only one part of the oil spec. Match the oil approval listed in your owner's manual or on the bottle before checkout.

How often should I change the oil on a 2018 Porsche Boxster S?

Castrol's service data indicates a 10,000 mi / 12 mo change interval for the 2018 Porsche Boxster S. Always follow your owner's manual and oil-life monitor. Severe service may require a shorter interval.

Do I need a new drain plug gasket?

Replace it when your vehicle uses a serviceable gasket or crush washer. Confirm the gasket size and drain plug torque from the service manual or parts counter.

Where to buy

These are retailer search paths for your vehicle. The specs above are checked — use the retailer's vehicle selector at checkout to confirm before ordering.

This section may include affiliate or sponsored retailer links. They are purchase paths, not fitment evidence.

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