gasket was blown long ago and we kept running the car. the issue got worse and engine started eating up oil. so, when my mechanic opened the head, he observed rust in rings and cylinder. so. gasket change+all rust cleaning+4 liter zic oil+labour+timing chain all costed nearly 16 k..
i was amazed that even with blown gasket, and very less oil in engine, the car kept running fine...which means the m13 is a very rough and tough thing..