1989 Mercedes-Benz 300 3.0L Petrol · MSL 1

This Mercedes-Benz 300 shows a concerning inconsistency in its recent MOT history, with the most critical failure occurring just one month before its last pass. The August 2025 failure—despite no recorded defects—suggests either a procedural oversight at the test centre or a vehicle that narrowly avoided a serious mechanical issue. The subsequent September 2025 pass implies either a corrective repair or a lenient re-test, but the lack of transparency in the record raises questions about what was actually addressed. Without specific fault codes or advisories, the trend remains ambiguous, though the absence of repeated failures on the same components in prior years does not indicate a worsening pattern. The vehicle’s current MOT is just over a year old, which is within the legal limit but not ideal for a car of this age and mileage. The recorded mileage of 108,603 miles over 37 years—approximately 2,935 miles annually—is unusually low for a vehicle of this era, suggesting it has spent extended periods stationary or seen minimal use. There are no MOT entries between July 2022 and June 2024, a gap of nearly two years, which could imply either a private owner deferring tests or a vehicle that was not regularly driven. The sudden reappearance of MOTs in mid-2024 and again in 2025 may reflect renewed activity, but the low mileage also hints at deferred maintenance rather than active use. Buyers should verify if the vehicle has been stored properly, as prolonged inactivity can accelerate issues like seized suspension components or degraded fluids. Given the sparse MOT record, a thorough inspection should prioritise the suspension system, particularly the rear axle and coil springs, as older Mercedes models are prone to bush wear and binding calipers. The August 2025 failure, despite no defects, warrants scrutiny of brake systems—especially rear binding or uneven wear—which could have been overlooked. Structural integrity is another critical area; corrosion around wheel arches, subframes, and exhaust mounts is common in this model and often goes unnoticed until it compromises safety. The absence of advisories in prior tests does not guarantee these issues are absent, so a detailed check of fluid levels (brakes, power steering, transmission) and alignment is essential. The lack of detailed fault history means no recurring problems are confirmed, but the vehicle’s age and mileage pattern demand cautious assessment.