Land Rover 306DT Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility

A reconditioned Land Rover 306DT engine typically costs between £6,500 and £9,500 for supply only, with fitted prices ranging from £7,475 to £10,800. Used units start around £3,500 but carry a severe risk of inherited crankshaft bearing wear. Full rebuilt units can exceed £11,000 for high-spec applications. Labour typically adds 15-20 hours at £65-£85/hr for an independent specialist.

• Used units start around £3,500 but carry a severe risk of inherited crankshaft bearing wear.
• Full rebuilt units can exceed £11,000 for high-spec applications.
• Labour typically adds 15-20 hours at £65-£85/hr for an independent specialist.

The most critical failure on the 306DT is crankshaft bearing fatigue, where the tin-aluminium coating flakes under load or extended oil intervals. This leads to a loss of oil pressure, a distinct bottom-end knock on cold starts, and eventual engine seizure. As bearings degrade, metal swarf circulates through the oil system, frequently destroying the oil pump and twin turbochargers. Once bearing knock is present, a full reconditioned replacement with a machined block is the only reliable fix.

• This leads to a loss of oil pressure, a distinct bottom-end knock on cold starts, and eventual engine seizure.
• As bearings degrade, metal swarf circulates through the oil system, frequently destroying the oil pump and twin turbochargers.
• Once bearing knock is present, a full reconditioned replacement with a machined block is the only reliable fix.

The 306DT twin-turbo diesel was fitted to the Land Rover Discovery 4 and Range Rover Sport (L494) between 2009 and 2016. It served as the primary diesel powerplant for these premium SUVs, offering 245-292 hp depending on the TDV6 or SDV6 tune. It replaced the older 2.7-litre V6 and was eventually succeeded by updated V6 and inline-six architectures.

• It served as the primary diesel powerplant for these premium SUVs, offering 245-292 hp depending on the TDV6 or SDV6 tune.
• It replaced the older 2.7-litre V6 and was eventually succeeded by updated V6 and inline-six architectures.

For any Discovery 4 or Range Rover Sport, a reconditioned 306DT is strongly recommended over a used unit due to the high risk of bottom-end failure. Used engines almost always inherit the same crankshaft bearing fatigue or oil pump contamination that caused the original removal. A proper reconditioned build machines the block, fits upgraded bearings, and replaces the oil pump and turbos to guarantee reliability. Reconditioned units also include comprehensive compression and oil pressure testing.

• Used engines almost always inherit the same crankshaft bearing fatigue or oil pump contamination that caused the original removal.
• A proper reconditioned build machines the block, fits upgraded bearings, and replaces the oil pump and turbos to guarantee reliability.
• Reconditioned units also include comprehensive compression and oil pressure testing.

You can confirm your engine code by checking the V5C registration document under the "Engine Number" field or by locating the code stamped on the engine block. The 306DT is a 3.0-litre V6 twin-turbo diesel, easily distinguished from the older 2.7L V6 or the modern Ingenium inline-six. Fitting a 2.7L wiring loom or ECU to a 306DT block will result in incorrect fueling and poor drivability. Both the 2.7L and 3.0L share the Lion V6 architecture, but they are not direct plug-and-play swaps due to displacement and turbo differences.

• The 306DT is a 3.0-litre V6 twin-turbo diesel, easily distinguished from the older 2.7L V6 or the modern Ingenium inline-six.
• Fitting a 2.7L wiring loom or ECU to a 306DT block will result in incorrect fueling and poor drivability.
• Both the 2.7L and 3.0L share the Lion V6 architecture, but they are not direct plug-and-play swaps due to displacement and turbo differences.