2016 Vauxhall Mokka 1.6L Diesel · OU16 APX

A chronic oil leak, persistent at every test since early 2025, forms the defining mechanical theme of this Mokka's recent history, sitting alongside a genuine escalation in under-bonnet and chassis deterioration that culminated in three Major defects at the April 2026 re-test. The latest examination on 13 April 2026 returned a Pass with an oil leak advisory still recorded, which confirms the seepage has been ongoing for at least three consecutive tests without yet becoming excessive enough to fail. More concerning is the cluster of Major defects logged only eleven days earlier on 2 April 2026, namely a perished nearside front lower suspension arm ball joint dust cover allowing dirt ingress, an incorrectly coloured pair of side repeater lamps, and a malfunctioning tyre pressure monitoring system. A Dangerous defect was also recorded on 28 March 2025 for a nearside rear brake pad worn below the 1.5 mm minimum, alongside a pitted and scored offside rear brake disc, demonstrating that the braking system has been allowed to reach a critical wear state at least once during the vehicle's life. The pattern is clearly one of deterioration rather than stable roadworthiness, with multiple safety-critical items having been flagged in their final stages of service life. Against an expected annual mileage of roughly 7,500 to 10,000 miles for a car of this age and class, the recorded 58,114 miles equates to around 5,811 miles per year, which is notably below average. This low accumulation rate is mechanically significant for a vehicle of its vintage, as lower mileage does not automatically equate to better condition; instead, it often correlates with prolonged periods of standing where moisture can collect in brake calipers, oil seals can harden and weep, and under-bonnet components such as ball joint boots and suspension rubbers can perish from lack of use rather than wear. The combination of low mileage, repeated oil leak advisories, and a cracked suspension boot dust cover is consistent with age-related degradation of static seals and flexible covers rather than distance-related wear, which means a buyer should not assume the car is mechanically under-stressed simply because the odometer reading is modest. Given the recorded advisories, particular attention during a physical inspection should focus on the engine and sump area for the source of the persistent oil leak, checking for fresh seepage at the rocker cover gasket, sump plug, and any visible crankcase seals, as well as inspecting the underside of the engine for accumulated oil residue that would indicate the leak has worsened since April. The nearside front lower suspension arm ball joint should be examined by hand for vertical play at the joint with the wheel turned under load, and the corresponding rubber boot on the offside should be checked for any splits, as perished dust covers on Mokka front suspension arms are a recognised weakness that typically progresses to joint failure once grit has entered. The brake system warrants a thorough check too, with the offside rear caliper examined for binding or sticky operation that may have caused the previously scored disc, and the rear pads measured for remaining friction material given that one set was already at the legal minimum in March 2025. On a test drive, listen for clonks or knocks from the front suspension over uneven surfaces, particularly at low speed over speed humps, which would indicate the failed dust cover has allowed contamination into the ball joint. Any pulling to one side under braking, a soft or spongy pedal feel, or vibration through the steering wheel would suggest the rear brake caliper is sticking or the previously scored disc has developed runout. Inspect the tyre pressure monitoring system warning light on the dashboard during ignition on, as a persistent or flashing TPMS indicator suggests the sensor fault flagged in April 2026 has not been resolved, and verify the side repeater lenses are the correct amber colour rather than the clear aftermarket units that caused the earlier Major defect. Finally, monitor the engine oil level on the dipstick before and after a short drive, as a visibly falling level combined with the recurring advisory would confirm the leak is active and likely to require sealing work in the near term.