W12 engine

The garage floor is slick with the lifeblood of a fallen titan. Before me sits what we’ve affectionately dubbed 'Bill,' the UK’s—and potentially the world’s—cheapest Bentley Continental GT. We picked it up for a meager £4,500, a price that would barely cover the ceramic brake option on a new model. The car is a rolling disaster of engineering disrespect. On the drive home, the oil pressure lamp screamed, the tires bled air through structural cracks, and the cabin smelled of a decade’s worth of unaddressed leaks. It needs an engine-out restoration and probably £20,000 to reach anything resembling factory spec. But we don't have that kind of time. In 48 hours, we’re aiming to drive this twin-turbocharged heap 1,500 miles to the African continent. This isn't just a repair job; it’s an exercise in technical triage. Respecting the engineering starts with diagnosing the damage. Stripping the boot revealed a battery of the wrong size with loose terminals and a buckled spare wheel that had clearly been driven on while flat. Most indicative of the previous owner's neglect was a rogue wire tucked under the center console. If the car gets stuck in 'Park'—a common failure for this platform—you pull the wire to override the shift interlock. It’s a bodge that speaks volumes about the 'fix' mentality this car has endured. Under the hood, the W12 engine looks impressive after a quick detail, but the reality is grimmer. The air filters were dated 2016. Since then, the car has covered 62,000 miles. In a high-performance, turbocharged environment, that level of filtration neglect is a death sentence for turbo bearings. Carbon buildup and the 2016 filtration time capsule Wrenching on a W12 requires a specific brand of patience. To even see the spark plugs, you have to peel back layers of intake manifolds and vacuum lines that have become brittle enough to shatter at a glance. As I pulled the Bentley air filters, they weren't just dirty; they were structural bricks of soot and oily deposits. This creates a massive restriction, forcing the turbos to work harder while pulling in contaminated air. Moving deeper, we found the spark plugs—likely the original set—with gaps so wide they looked like they belonged in a tractor. Interestingly, the plugs we pulled (PFR 6Q) didn't even match the official NGK replacements (PZFR 6Q11) specified for this year. Someone had thrown whatever fit the threads into this engine just to keep it moving. Once the cam covers were off, the news improved. Despite the external neglect, the internal architecture of the head was surprisingly clean. No excessive sludge, no carbon-caked valves, and the timing chains were tight. It suggests that while the 'major' services were ignored to save cash, the car likely had regular oil slops to keep it from seizing. We replaced the rocker cover gaskets, which had turned into brittle plastic rather than pliable rubber, and addressed the primary source of our environmental catastrophe: the oil pressure switch. This £30 component was responsible for the majority of the oil slick following us down the M20. Precision matters here; skipping the intake manifold gaskets or reusing the crushed o-rings on the coil packs would have invited vacuum leaks that the Bosch ECUs would never be able to trim out. Salvaging performance with Lamborghini spare parts The climax of this build came when we fired the engine after the 'birthday' service. It didn't purr; it coughed. A heavy misfire and a hissing vacuum leak threatened to end the Africa trip before it reached the ferry. The intake manifold had popped a vacuum line during installation, but even after that was secured, the engine was clearly dropping cylinders. Using a diagnostic scanner, we saw a laundry list of codes: random multiple cylinder misfires, turbo boost pressure not detected, and mass airflow sensor circuit highs. The culprit was a combination of heat-damaged wiring and a dead coil pack. In a moment of garage serendipity, we realized that the Volkswagen Group architecture works in our favor. We didn't have Bentley coil packs on the shelf, but we had leftovers from a Lamborghini Gallardo and an Audi RS6. While the Bentley units are visually distinct, the electrical terminals and resistance values are identical. We swapped in the Italian-German hybrid parts and watched the misfire counters drop to zero. To protect the melted MAF sensor plug—damaged by an exhaust leak we simply cannot fix without pulling the engine—we used a makeshift heat shield crafted from leftover sandwich foil and a scrap piece of aluminum from a BMW Z4. It’s not elegant, but it reflects the mechanical reality of getting a budget build to the finish line. The long waft toward the Moroccan border Rolling out of the shop on a fresh set of Mulliner split-rim wheels found on Facebook Marketplace for £750, the Bentley finally looked the part. The transformation from a 'tarmac-stained' wreck to a luxury grand tourer was complete, at least aesthetically. On the road to the Channel Tunnel, the W12’s torque became evident. This engine configuration is essentially two VR6 engines sharing a common crank, offering a compact footprint with massive power delivery. At 80 mph, the car is 'floaty' in the best sense of the word. The new rear drop links have silenced the suspension knocks, and the Mazini budget tires—rated for 206 mph, though we wouldn't test that—provide a surprisingly smooth ride. However, the journey revealed the car's remaining scars. The fuel gauge is a work of fiction; we brimmed the tank, yet it only registered three-quarters full. More concerning is the ZF gearbox behavior. Under heavy load, it occasionally clunks or 'hunts' between fourth and sixth gear, suggesting the internal solenoids or fluid levels are struggling with the heat. We’re currently averaging 12.7 MPG, which means our 'cheap' Bentley is going to eat its purchase price in fuel before we hit Marrakesh. But as we sat on the train, smelling the faint scent of 'lightly misting' oil on the hot exhaust, there was a sense of accomplishment. We took a car destined for the scrap heap and turned it into a cross-continental adventurer. Engineering respect and the lesson of Bill The lesson here is about the threshold of maintenance. When you buy a car like a Continental GT for the price of a used Ford Fiesta, you aren't just buying a vehicle; you’re inheriting a decade of decisions. 'Bill' survived because the fundamental VW engineering is robust, but it was on the verge of a terminal failure caused by something as simple as a £50 air filter. If you're going to own a high-performance machine, you have to respect the intervals. Cheapness is a trap if it leads to the neglect we saw in the 2016-dated components. We’ve given this Bentley a second chance, but the real test lies in the 1,500 miles of desert road ahead. If the Lamborghini parts and sandwich-foil heat shields hold, it’ll be a testament to the fact that with enough garage skill and a bit of audacity, even the world's cheapest luxury car can find its way back to the road.