2026-08-15 · 5 min read
BMW 4 Series Real Workshop Cases Malaysia — 4M Car Care
Real BMW 4 Series repair cases from our Bandar Sri Damansara workshop — engine, transmission, aircon and suspension.
Case 1: F36 Gran Coupe 428i — N20 Chain + Valve Cover (75,000 km)
F36 428i came in for an oil leak. Found oil misting from valve cover gasket — common on N20 at this mileage. While removing the valve cover, ISTA also showed P0016 code stored. Borescope confirmed chain guide wear. Replaced: valve cover gasket () and full timing chain kit () in one job — saved labour by combining. Total. Owner declined chain job initially but agreed when we showed the borescope footage.
Case 2: G26 Gran Coupe 420i — B48 Water Pump + Carbon (68,000 km)
G26 420i came in for a CBS oil service. Owner mentioned 'slight temperature needle fluctuation' — we checked and found coolant loss of about 150ml since last service. ISTA showed electric water pump performing intermittently. Also did carbon inspection — intake valves had moderate buildup at 68,000 km (mostly KL city driving). Combined water pump replacement () + walnut blast () in one workshop visit. Car now runs at stable temp with clean intake valves. Total.