Mobil 1 C40 GT 0W-40 (24 × 1-L case)
If you service modern Porsche GT cars, you’ve likely encountered “C40 GT” on service sheets and oil caps. Mobil 1 C40 GT 0W-40 is a purpose-built, Porsche-approved formulation engineered for the unique demands of GT engines: from extended high-RPM track sessions to hot-soak street use. Below we’ll cover what makes it different, when to use it, and how to stock it efficiently for your bay.
What Makes C40 GT Different
- Thermal stability at speed: The oil maintains film strength and viscosity under sustained load, helping protect critical components during long stints.
- Deposit control: Advanced detergency reduces varnish and sludge formation, supporting consistent power delivery.
- Cold-start readiness: The 0W rating supports rapid circulation on start-up, reducing wear on tight-clearance valvetrain parts.
- Visual ID: C40 GT is green, which helps technicians prevent cross-fills with non-approved products.
Use It Only Where It’s Approved
Mobil 1 C40 GT is intended for Porsche GT engines that specifically call for the Porsche C40 GT approval. It is not a drop-in substitute for models that require A40, C20, C30, or standard C40 approvals. Always confirm the spec in the owner’s manual or service information.
Shop Tips for Faster, Cleaner Services
- Stage by VIN: Pre-pull the correct oil based on VIN-decoded spec to eliminate bay delays.
- Label funnels and tanks: Dedicate green-tagged tools for C40 GT to avoid cross-contamination.
- Document the spec: Note “Porsche C40 GT” on the RO so your customer records reflect the approved fill.
Stocking: Why the 24 × 1-Liter Case Works
Many GT services require multiple liters. A 24-count 1-liter case keeps per-service pulls tidy, reduces partials, and simplifies inventory counts for audits. It’s also ideal for clubsport/track customers who prefer to keep labeled liters in their paddock kits.
Bottom Line
If the cap and manual say C40 GT, use an oil that’s built and approved for it. Mobil 1 C40 GT 0W-40 delivers the thermal resilience, cleanliness, and protection Porsche GT engines demand, and the 24 × 1-liter case format makes it easy for shops and serious drivers alike.