1997 Vauxhall Omega 2.5L Petrol · P416 CNP

A persistent oil leak has been the defining mechanical thread across the MOT history of this 1997 Vauxhall Omega, with the issue flagged at every recorded test since at least 2022 and confirmed again on 16 May 2026 when the vehicle last passed alongside an identical advisory. The fact that the leak has remained described as "not excessive" for three consecutive years suggests a slow, chronic seepage rather than a sudden seal failure, though any buyer should recognise that such advisories can mask a gradually worsening condition once a threshold is crossed. Beyond the seepage, the broader record points to an ageing but largely roadworthy saloon, with the only other notable advisories being a cracked or perished nearside rear tyre flagged in May 2024 and a general note of underbody corrosion from October 2022. The absence of any advisory-free tests and the recurring nature of the underbody corrosion note indicates that structural integrity is an ongoing concern on a 29-year-old vehicle of this type. The recorded mileage of 81,635 miles equates to roughly 2,800 miles per year over the vehicle's lifetime, which is notably low for a car of this age and points to either extended lay-ups, limited use as a second car, or predominantly short journeys. The MOT history itself is unusually sparse, with only four tests recorded since 2022 and a gap between October 2022 and May 2024 where no test was taken, suggesting the vehicle may have been off the road for an extended period during that interval. Low annual mileage with intermittent testing is mechanically significant because prolonged standing accelerates deterioration of rubber components, brake discs and callipers can corrode and seize, fluid systems lose their protective qualities, and corrosion progresses beneath the car without the regular washing-off of road salts that driving provides. For a prospective buyer, the oil leak warrants a hands-on inspection rather than reliance on the advisory wording alone. Before starting the engine from cold, look for fresh oil residue on the sump, cam covers, and around the crankshaft seal area, and during a test drive listen for any change in engine note that could indicate oil pressure dropping as the leak worsens under load. The underbody corrosion advisory from 2022 means a careful examination on a ramp is essential, paying particular attention to the subframe, suspension mounting points, brake and fuel lines, and inner sills, as these are the areas most prone to structural rust on the Omega platform. When driving, listen for clonks or knocks from the front suspension over uneven surfaces, which could indicate worn wishbone bushes or anti-roll bar links that the MOT would not necessarily flag until play became visible on the ramp. Test the brakes firmly from speed and at low speed to feel for any judder that would suggest corroded or warped front discs, a common consequence of a car that spends long periods stationary. Finally, examine the nearside rear tyre sidewall closely for any cracking or perishing, as the 2024 advisory was noted only two years ago and rubber degradation tends to progress steadily on a low-use vehicle.