E88 · 2010–2013
In spring 2010 the 135i Convertible moves to the single-turbo N55 six with unchanged power. Body maintenance stays the same: rollover bars tested at the vehicle check, no fluid change for the top hydraulics.
Figures apply to the cited configuration and market; equipment and transmissions may vary by production date.
Specification source : [2] BMW Group
Figures published at launch for the cited manual configuration. Consumption is a test-cycle measurement, not a real-world guarantee; automatic versions may differ. Source [2]
2,979 cc straight-six which, according to BMW, combines TwinPower Turbo, High Precision Injection and VALVETRONIC for the first time; a single twin-scroll turbocharger. 225 kW at 5,800 rpm, 400 Nm from 1,200 to 5,000 rpm. New six-speed manual, or the seven-speed double-clutch gearbox (DKG) available from March 2010. BMW quotes 5.6 s and 8.6 l/100 km with the manual, 5.5 s with the DKG.
The sources consulted do not give the N55 oil change quantity: the TIS archive used (issue 12/2007) predates this engine. Have it read from BMW documentation using the VIN. Longlife-04 oils are approved for petrol engines only in the EU, Switzerland, Norway and Liechtenstein; outside that area, use the approval BMW specifies for the country.
Source : [1]
The CBS calculates the oil due date from the fuel used; the sources consulted do not give the N55’s own starting value. The service content follows BMW’s list for petrol models built from 03/2007. At every oil service: oil and filter, handbrake check, microfilter. Every third oil service: air filter and spark plugs. Front and rear pads, brake fluid and the vehicle check each have their own service.
At the vehicle check, the workshop triggers the rollover protection system via the diagnosis interface, with the top opened first. The top’s hydraulic system is filled for life: no fluid change is scheduled, and only the approved fluid is used if it leaks.
One twin-scroll turbocharger instead of two, an electronically controlled wastegate, VALVETRONIC, and solenoid injectors instead of the N54’s piezo injectors. Injectors, turbo and intake parts are therefore not interchangeable: order them by engine code. The timing drive is still a chain.
Source : [4]
Front apron with Air Curtains, headlights with an upper accent strip, L-shaped tail lights in an all-red housing and LED accents with the xenon headlights. BMW Austria’s January 2013 price list still offers the 135i Convertible, at 8.6 l/100 km.
Give the VIN so the exact oil quantity can be looked up. Count oil services since the last spark plugs and air filter, and say whether the car has the manual or the DKG.
AutoKarnet advice
CBS: starting value 25,000 km
The CBS calculates the due date from the fuel used: 25,000 km is only a starting value. From 09/2008 BMW encodes 30,000 km for several ECE petrol engines, including the N54; the list does not name the N52K.
Source [16]CBS due date per axle
Two separate services. Pads replaced, brake air ducts cleaned, discs checked (surface, thickness) and replaced below minimum thickness; at the rear the handbrake is checked too.
Source [10]At every oil service
With air conditioning: microfilter replaced at every oil service, per BMW’s operation list for petrol models built from 03/2007.
Source [17]Every third oil service
Replaced at every third oil service, so they follow the oil interval calculated by the CBS.
Source [17]Every third oil service
Filter element replaced at every third oil service; BMW asks for shorter intervals in dusty regions.
Source [17]Due date shown by the CBS
A separate service: brake fluid replaced, then the CBS display reset. The documents consulted for the Coupé and Convertible do not state the interval.
Source [11]Due date shown by the CBS
Same scope as the Coupé plus one Convertible item: the workshop triggers the rollover protection system via the diagnosis interface, after opening the top first.
Source [12]No scheduled change
The system is filled with lifetime fluid. If it leaks, only the approved fluid may be used; the system bleeds itself through repeated operation of the top.
Source [13]By the N55 engine code and a build date from spring 2010. In BMW Austria’s price lists the 135i Convertible type key changes from UN91 (03/2009) to UN71 (09/2011).
Yes: from March 2010 BMW offers the seven-speed double-clutch gearbox instead of the former six-speed automatic. With it the 135i Convertible does 0–100 km/h in 5.5 s at 8.6 l/100 km, less than the former automatic according to BMW.
Source : [2]
At the vehicle check it triggers them via the diagnosis interface, after opening the top. This test is in BMW’s vehicle check list for the Convertible.
Source : [12]
It is not published in the sources consulted. Have it read from BMW documentation using the VIN rather than reusing the N54 figure.
AutoKarnet advice
BMW AG — TIS (archive) · EN · Europe · SI 11 03 04 (156) · revision 09/2005 · Accessed 08/10/2026
BMW Group · DE · Germany · Presse-Information (PDF attachment), pp. 1–3 · Accessed 08/10/2026
BMW of North America · EN · United States · Engine section: “N55 designation” · Accessed 08/10/2026
BMW of North America — technical training (archived copy) · EN · United States · Initial print 02/10 · pp. 4–10: overview (single twin-scroll turbo, solenoid injectors vs piezo on HPI), technical data, N54 variants (135i E82/E88) · Accessed 08/10/2026
BMW Group Schweiz · DE · Switzerland · Medien-Information 12/2010 (PDF), p. 2 and section 2.1 “Das neue BMW 1er Coupé / Cabrio” · Accessed 08/10/2026
BMW Austria · DE · Austria · “BMW 1er Reihe Coupé E82” and “BMW 1er Reihe Cabrio E88” · kW/PS, type keys · Accessed 08/10/2026
BMW Austria · DE · Austria · “BMW 1er Coupé (E82)” and “BMW 1er Cabrio (E88)” · kW/PS, type keys · Accessed 08/10/2026
BMW Austria · DE · Austria · “BMW 1er Coupé (E82)” and “BMW 1er Cabrio (E88)” · Accessed 08/10/2026
BMW AG — TIS (archive) · EN · Europe · RA 00 00 610 · E88 archive copy · Accessed 08/10/2026
BMW AG — TIS (archive) · EN · Europe · RA 00 00 612 (front) and RA 00 00 614 (rear, next document) · E82 archive · Accessed 08/10/2026
BMW AG — TIS (archive) · EN · Europe · RA 00 00 618 · E82 archive · Accessed 08/10/2026
BMW AG — TIS (archive) · EN · Europe · RA 00 00 625 · E88 archive: “Trigger rollover protection system (Convertible) via diagnosis interface” · Accessed 08/10/2026
BMW AG — TIS (archive) · EN · Europe · RA 54 34 · “No changing of the hydraulic fluid necessary” · Accessed 08/10/2026
BMW of North America (NHTSA file) · EN · United States · Dealer message of 26 Oct 2010, pp. 1–2: model year 2008–2010 135i · Accessed 08/10/2026
BMW of North America (NHTSA file) · EN · United States · June 2013 revision (supersedes July 2012), pp. 1–3: E82, E88 MY 2008–2010 135i · Accessed 08/10/2026
BMW AG — TIS (archive) · EN · ECE · SI 00 13 07 (391) · 10/2007 · launch 09/2008 · Accessed 08/10/2026
BMW AG — TIS (archive) · EN · Europe · RA 00 00 610 · E82 archive copy · Accessed 08/10/2026