1991 Land Rover Range Rover 3.9L Petrol · J501 FLG

Aluminium skin over a steel skeleton: Hagerty's Classic buying guide warns that the frame and chassis both rust and that even good-looking cars hide it, with the body mounts, rear crossmember, inner rear wheelarches, inner front wings and both sills the priority checks, and boot floors suspect on cars built after 1989. LandyZone owners describe the same failure starting as water ingress: the scuttle sealant under the bonnet top hardens and cracks, water pools behind the bulkhead and the rot travels into the dash supports and footwells. Section and frame repairs are labour-intensive, and corrosion advisories are the routine MOT failure.

The Buick-derived Rover V8 is hardy until it overheats once. When the 3.5 block was over-bored to 3.9 roughly 200 thou was taken out of the aluminium that holds the cast-iron liners, and LandyZone members describe the block cracking around that interference fit - with symptoms identical to a blown head gasket, including a pressurised coolant system and, in bad cases, a metallic tap at piston speed once hot. RoverParts' Rover V8 head gasket guide lists the same trail: temperature spikes, gas pressurising the coolant, an outboard blow sounding like an exhaust leak, and heads and block needing machining after a serious overheat. Hagerty advises checking V8s for bottom-end knocks and timing chain rattle before buying.