D5204T (D5204T2/T3/T4/T5/T6/T7) vs B6304T
Side-by-side reliability comparison
Specifications
Character
D5204T (D5204T2/T3/T4/T5/T6/T7)
"Volvo's 2.0 five-cylinder diesel, a short-stroke version of the 2.4 D5, sold as D3 and D4 (136-177 hp) in the C30, S40, V50, C70, V40, S60, V60, S80, V70 and XC60 from 2010 until the four-cylinder VEA took over in 2014-2015. Smooth and torquey. Watch the auxiliary-belt tensioner (a failed belt can take out the timing belt), the timing belt at 180,000 km or 10 years, and coolant loss: mechanics report cracked blocks and head gaskets on some engines."
B6304T
"Volvo's transverse 3.0 turbo straight-six (SI6 family) in the S80, V70, XC70, XC60, S60 and V60 T6, 285-304 hp, and 350 hp in the S60/V60 Polestar. Twin-scroll turbo; the timing chain and the accessory drive sit at the back, next to the gearbox, so there is no timing belt to change. Workshops call it robust if serviced. Watch oil consumption on engines built before May 2011 (Volvo bulletin: cam cover seal, valve guides), a torn PCV oil-trap diaphragm, and the water pump and accessory drive."