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The Sián FKP 37 is the first Lamborghini to pair a V12 with hybrid power, and one of the rarest cars the company has built: 63 coupes, honoring Lamborghini's founding year of 1963, followed by just 19 Sián Roadsters. Its 6.5-liter V12 is uprated to 785 CV, and a 48-volt, 34 hp e-motor built into the gearbox draws on a supercapacitor rather than a conventional battery, for 819 CV in total. This is the fifth guide in our model-by-model series, after the Gallardo and Murciélago guides and our Aventador and Huracán guides.
We will be straightforward: with so few cars built, there is very little public service information for the Sián. We have not found a published Lamborghini maintenance plan for it, so this guide is short. What we can share are the fluid capacities and intervals listed in a compiled OEM fluid table for the Sián FKP 37 and Sián Roadster, which list the same figures for both cars. Everything else is marked unverified. Sián owners will be working with a Lamborghini dealer and the car's own booklet, and those are the final word.
The figures below come from a compiled OEM specification table, not from a Lamborghini booklet we have read. “Check” means inspect and top up or correct as needed.
| Service item | Interval (compiled OEM table, Sián FKP 37 and Sián Roadster) | Notes | What's needed |
|---|---|---|---|
| Service cadence, engine oil and oil filter | Unverified. No published Sián schedule found | The fluid table below works on a 15,000 km check interval. Confirm the service interval and oil specification in your booklet | Engine oil and filter to your booklet. No Bullstuff page lists Sián fitment for an oil filter; email us with your VIN |
| Gearbox oil (7-speed ISR with integrated e-motor) | First change at 2,500 km; then check every 15,000 km and change every 30,000 km / 24 months | Same figures for coupe and Roadster | About 2.6 liters service fill (3 liters dry), to the specification in your booklet |
| Front differential oil | First change at 2,500 km; then check every 15,000 km and change every 30,000 km / 24 months | All-wheel drive (Haldex gen. IV) | About 0.8 liters, to the specification in your booklet |
| Rear differential oil | First change at 2,500 km; then check every 15,000 km and change every 30,000 km / 24 months | Mechanical self-locking rear differential | About 1.3 liters service fill (2 liters dry), to the specification in your booklet |
| Brake fluid | Change every 15,000 km / 12 months | Same for coupe and Roadster | About 0.75 liters, to the specification in your booklet |
| Engine coolant | Check every 15,000 km; change every 24 months | Main V12 cooling circuit | About 25 liters, to the specification in your booklet |
| E-motor coolant | Check every 15,000 km; change every 24 months | A separate circuit for the electric motor | About 1.1 liters, to the specification in your booklet |
| Power steering and front lift fluid | Check every 15,000 km | No change interval listed | Power steering about 1.7 liters; front lift system about 0.3 liters |
| 48-volt supercapacitor and hybrid system | Unverified. No public inspection or replacement interval found | No public data on its upkeep | Ask your Lamborghini dealer |
| Emergency door-release battery | Unverified. No public interval found | Part of the door emergency-release system | 470971418A, whose product description lists the Sián, the Aventador SVJ and the Countach |
The first 2,500 km matter. The fluid table calls for a first change of the gearbox oil and both differential oils at 2,500 km. If you are buying a low-mileage Sián, ask for proof that this first service was done.
Time counts as much as distance. Brake fluid is listed for a yearly change and both coolant circuits for a change every two years, however few miles the car has covered. A Sián that is mostly admired in a collection still needs its fluids on schedule.
The Sián shares its basic V12 layout with the Aventador, but it is not simply an Aventador with a badge. Its engine is uprated, its gearbox carries the e-motor, and it has its own cooling circuit for the hybrid system, so do not assume Aventador parts or intervals carry over. Check every part by VIN.
For a broader walk-through of filters, brakes, clutches, plugs and fuel pumps, see our routine maintenance guide.
Bullstuff, also known as Lambostuff, is No Limits Solutions LLC in Xenia, Ohio. Parts for a car this rare usually come down to a VIN lookup, and we are glad to do that research for you. The intervals above are from a compiled table, not a factory booklet, so please confirm every one against your car's own maintenance booklet or with your Lamborghini dealer before you book the work. If you need a part for your Sián, email us at sales@bullstuff.com with your request, and it will be handled promptly.