I'm doing an oil service on my son's 2006 1.2 Panda Dynamic (now on 266 000km and going strong). There's a fair bit of oil residue surrounding where the air box fits to the intake. There is a rubber seal/gasket present, which seems to be in good shape, but the air box has a very sloppy fit to the intake. Is this normal or should I be looking to replace the seal?