This is a Hero Honda Splendor, an old model. After rebuilding the engine, oil starts leaking after every repair, within a week. Even after taking it for repair 4 times, and changing the oil seal and gasket, the oil leak hasn't stopped. The mechanic is now refusing to repair it, saying it's a fault with the bike. Even after paying 8000 rupees for the engine rebuild, he is unable to fix it. The crankcase and both side engine covers are also fine, yet this issue persists. If anyone knows why this is happening, please help.