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Porsche · Known Issues

2018 Porsche Cayman Problems: 1 Known Issue

2018 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2018 Porsche Cayman has 1 documented issue, with 1 rated critical. The most serious is 718 Cayman (982) Early Turbo-Four High Oil Consumption ($500-$8,000 repair). Across all issues with published estimates, repair costs range from $500 to $8,000. DIY maintenance guides at au7o.io.

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All 1 Known Issue

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On the 2017-2020 Porsche Cayman, a number of early 2.0L and 2.5L turbocharged flat-four 718 engines consume oil at a high rate — owners report roughly a quart per 1,000 miles, with the worst cases needing engine replacement under warranty. Some 2019 2.0L cars also suffered oil-separator (PCV) diaphragm failures that let oil be drawn into the cylinders, sometimes appearing right after an oil and filter change.

This issue also affects: Audi A4, SEAT Leon, Audi Q5

Common Symptoms

  • Frequent low-oil warnings
  • Needing to top up oil between services
  • Blue smoke from exhaust
  • Oil consumption ~1 quart per 1,000 miles

How to Fix

Document consumption with a Porsche oil-consumption test. Replace a failed air-oil separator / PCV diaphragm. Severely affected engines were replaced under warranty by Porsche; otherwise monitor level closely and top up with the correct specification oil between services.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine Porsche 0PC115099B complete oil separator

    Confirm VIN and order one 9A210747300 seal separately.

    PartsGeek
  • Genuine Porsche 9A210747300 oil-separator seal

    2017-2020 718 Cayman 2.0L/2.5L turbo source range; Porsche 9A210747300. This seal alone does not repair consumption.

    RM European
  • Genuine Porsche 9A210790400 AOS diaphragm

    2017-2020 Porsche 718 Cayman 2.0L/2.5L source range, part 9A210790400; do not use for housing, port, check-function, turbo or cylinder faults.

    Sierra Madre Collection

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$500 - $8,000

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Other Porsche Models

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Frequently Asked Questions

What are the most common Porsche Cayman problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2018 Porsche Cayman has 1 documented issue. The documented issue is: 718 Cayman (982) Early Turbo-Four High Oil Consumption. Of these, 1 is rated critical and should be addressed promptly.

Is the Porsche Cayman reliable?

The 2018 Porsche Cayman has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: 718 Cayman (982) Early Turbo-Four High Oil Consumption. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Porsche Cayman problems?

Repair costs for known Porsche Cayman issues range from $500 to $8,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 718 Cayman (982) Early Turbo-Four High Oil Consumption, typically costs $500-$8,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2017-2020 Porsche Cayman 718 Cayman (982) Early Turbo-Four High Oil Consumption?

A number of early 2.0L and 2.5L turbocharged flat-four 718 engines consume oil at a high rate — owners report roughly a quart per 1,000 miles, with the worst cases needing engine replacement under warranty. Some 2019 2.0L cars also suffered oil-separator (PCV) diaphragm failures… Repairs typically run $500-$8,000. Severity: high.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.