Nano Engine has a major design related problem with coolant and/or lubricating system. After about 5000 to 10,000 kms of run, seal on the coolant pump shaft, which is made of rubber, leaks. This is normal with all auto engines and its coolant pumps. When this happens, leaking coolant enters cranks case and mixes with engine lubricating oil. This is not normal and not at all desirable. This should never happen for any engine with its lubricating system. From this point onwards, the engine is likely to fail by seizure. This is a major design problem. Therefore, all NANO cars currently in service must be recalled and some proper refitting must be provided to their coolant system.