2003 Lexus RX300 3.0L Petrol · LS53 WUG

The most recent MOT, dated 4 December 2025, was a pass but carried several advisories – rear sub‑frame corrosion, a minor exhaust leak, rear brake disc wear and reduced effort on the nearside parking brake. Over the last six years the vehicle has alternated between passes and occasional failures, the failures being triggered by the same items that now appear as advisories. This pattern suggests a maintenance regime that has kept the car road‑worthy but has not fully addressed a handful of recurring wear points; overall the trend is stable but with a slight tendency toward deterioration if the noted issues are not remedied promptly. At 134 508 mi the RX300 has logged an average of roughly 5 850 mi per annum over its 23‑year life, well below the typical 10‑12 000 mi per year for a family SUV. The low annual mileage indicates periods of light use or extended storage, which reduces wear on engine and drivetrain components but can exacerbate age‑related problems such as rubber decay, fluid oxidation and corrosion on static parts. There are no obvious spikes in mileage that would point to a period of heavy abuse, so the primary mechanical wear will be governed more by calendar age than by distance travelled. A prospective buyer should give particular attention to the rear sub‑frame and associated mounting points. Although the MOT notes the corrosion is not seriously weakened, visual inspection for rust perforation, flaking paint and any flex when the rear is rocked is essential; any audible clunk or excessive play under load could indicate structural compromise. The rear brake discs, especially the nearside unit flagged for scoring, should be measured for remaining thickness and inspected for deep grooves that could cause brake shudder or reduced stopping efficiency; replacement is likely required within the next few thousand miles. The parking‑brake cable or rear‑drum mechanism showing low effort should be tested for proper engagement and adjusted or rebuilt as needed. The minor exhaust leak, recurring across several years, should be located – typically at a rusted pipe joint or gasket – as it can raise emissions, increase engine back‑pressure and produce a noticeable ticking or hissing sound at idle. Given the vehicle’s age and low utilisation, the buyer must also check items that deteriorate with time. Examine all four tyres for sidewall cracking, dry rot and tread depth; the rear tyre was previously close to the legal limit, so a fresh set may be prudent. Verify the condition of the 12‑volt battery, the alternator output and the electrolyte level, as long periods of standing can lead to sulfation. Inspect coolant, brake fluid and engine oil for colour and moisture – a change of these fluids within the last 12 months is advisable. Look for corrosion on the under‑carriage, suspension bushings and rubber mounts, and listen for any clunking, rattles or uneven vibration during a short drive, which could reveal hidden wear in the coil springs, control arms or steering rack. A complete service history, including any recent brake or exhaust work, will give further confidence that the vehicle’s mechanical health is being actively managed.