Audi R8 Coupé, 423/427 (EU)

Additional Notes

• All six configurations specify a transaxle, manual arrangement, meaning the gearbox and final drive share a common housing located at the rear axle rather than adjacent to the engine.
• The Audi R8 Coupé 4.2 FSI quattro at 309 kW (2007-2010) and the subsequent 316 kW variant (2010-2012) both carry a 3.5-liter transaxle fluid capacity, indicating the same underlying gearbox unit across that power increase.
• The 316 kW variant of the 4.2 FSI quattro saw its transaxle fluid capacity rise from 3.5 liters to 4 liters when the 2012-2015 production period began, pointing to a revised or replaced gearbox assembly at that point in the model's life.
• The 5.2 FSI quattro at 386 kW follows the same capacity pattern as the 4.2 FSI quattro: a 3.5-liter fill for the 2009-2012 period, stepping up to 4 liters for the 2012-2015 period.
• The R8 5.2 FSI plus quattro at 404 kW, available only in the 2012-2015 period, shares the 4-liter transaxle capacity with the standard 5.2 FSI quattro of the same years, suggesting a common gearbox unit regardless of the power difference between those two V10 variants.
• All capacity figures are specified under normal use conditions, meaning the values reflect standard operating service fills rather than a dry-fill or overhaul quantity, which would typically be higher to account for residual fluid left in passages and coolers.
• A 3.5-liter transaxle capacity is a relatively substantial fill volume, consistent with a rear-mounted unit that integrates both the differential and gearbox functions in a single case, requiring fluid to lubricate a larger combined internal volume.
• The increase to 4 liters across both the 4.2 and 5.2 engine families from 2012 onward represents a 14 percent rise in fluid capacity, a change of practical significance when servicing, as underfilling a transaxle can accelerate wear on gear sets and bearings.