PistonHeads: 2015 BMW M135i, Colchester
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PistonHeads: 2015 BMW M135i · Colchester · £12,995 · 99,989 miles
Used car: 2015 BMW M135i, Colchester
This is a high-mileage, modified (Stage 2 tuned) M135i still awaiting dealer preparation, which adds uncertainty around its true mechanical state and how the tune affects future reliability, warranty and insurance considerations. The MOT and mileage trail look clean and consistent, but the tuning, three previous owners, and unfinished preparation mean this needs thorough in-person inspection and direct questions to the seller before committing.
⚠ Things to check
- Seller describes the vehicle as 'Stage 2 Tuned' and 'Modified' with a 'Loud Exhaust', a substantial deviation from standard specification that should be fully understood before purchase
- Listing states the car is 'JUST ARRIVED AND AWAITING PREPARATION', meaning it may not yet be in its final, sale-ready state
Pros
- MOT is currently valid, running to October 2026
- Mileage progression across the MOT history is consistent and shows no implausible jumps or drops
- MOT advisories are dominated by ordinary tyre wear rather than any recurring mechanical fault
- Sold by a dealer, which typically carries stronger consumer protections than a private sale
- Seller states 13 BMW main dealer services have been carried out
Cons
- The car is described by the seller as 'Stage 2 Tuned' with a 'Loud Exhaust' and 'Modified', which changes the risk profile versus a standard example and may affect warranty or insurance considerations
- Three previous owners recorded, more than would be typical for this age of car
- The listing states the car is 'awaiting preparation', meaning it may not be in its final sale-ready condition when viewed
- The most recent MOT flagged front brake pads at 3mm, close to the wear limit
Price and what it discloses
The listing gives an asking price of £12,995 but discloses no platform valuation, no comparable median, and no price history or reduction to set that figure against. There is nothing here to read the price against, so no verdict on whether it is well priced can be offered. If you want to judge value on price alone, search this site for other 2015 M135i listings at a similar mileage and compare.
Modification and condition status
The seller description states the car is 'Stage 2 Tuned' with a 'Loud Exhaust' and is described as 'Modified', and also says it is 'JUST ARRIVED AND AWAITING PREPARATION'. This is a significant disclosure: a Stage 2 tune on a turbocharged engine typically involves remapping and supporting hardware changes that go well beyond a standard car, and this changes the risk profile substantially versus a stock M135i. A modified, tuned car carries added mechanical stress, may affect warranty and insurance terms, and its history under a previous owner's use (three previous owners are recorded) is unknown from this listing alone. 'Awaiting preparation' also suggests the car has not yet been through the dealer's usual pre-sale checks, so what you view today may not reflect its final prepared state.
MOT and mileage history
The MOT record is valid, extending to October 2026, and the history stretches back to 2018 with a consistent, plausible mileage progression from around 15,000 miles up to just under 100,000 miles, which is a reasonably high but not extreme mileage per year (inferred) for a car of this age. There have been three MOT failures over the years, but they were for tyre tread depth, a tyre cut, and non-conforming number plates, all straightforward and not mechanical in nature. Advisories have been dominated by tyre wear and tyre damage across several tests, which is ordinary and expected wear rather than a recurring mechanical fault. The most recent test (September 2025) flagged front brake pads wearing thin at 3mm, which is worth checking has been addressed since, given it was already close to the replacement threshold at that test.
Ownership and seller type
Three previous owners is on the higher side for a car of this age, though not unusual for a performance hatchback likely to change hands often. This is a dealer sale, which typically affords the buyer stronger consumer protection than a private sale, though the specifics of any warranty offered by this dealer are not stated in the listing and should be confirmed directly.
Engine and drivetrain
The car is described as having a 3.0-litre turbocharged engine driving the rear wheels, consistent with the N55 straight-six used across BMW's contemporary M135i and 335i/435i range (inferred from the engine size and turbo aspiration listed). This engine is chain-driven rather than belt-driven, and while there are known chain and tensioner concerns discussed for some N55 applications, this is worth confirming with the seller directly rather than assuming it applies here.
💬 Ask the seller
- The description mentions the car is Stage 2 tuned and modified: what specific modifications were made (remap, hardware changes), by whom, and is there documentation or a record of the tune?
- Since the listing says the car is 'awaiting preparation', what work will be carried out before sale, and can this be completed and inspected before purchase?
- The most recent MOT (September 2025) noted the front brake pads wearing thin at 3mm: have these been replaced since, and is there evidence?
- Has the timing chain or chain tensioner ever shown signs of rattling or been inspected or replaced, and if so at what mileage?
- The listing states '13 BMW Main Dealer Services': can you provide the stamped service book or dealer records showing service dates and mileages, particularly for the period since the tune was applied?
- What warranty, if any, does the dealership offer on this vehicle, and how does it interact with the fact the car has been modified?
🔗 Useful checks
- MOT history — Free DVLA check
- Vehicle enquiry — Tax, MOT status, make, colour
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