First of all, could anyone tell me what oil is best to use in a Glanza V? I was thinking of 5w-50 Fully Synthetic but not too sure? Also, Is there a good method to undersealing or what products to use, for example Underbody Seal, WaxOyl, Upol Gravitex stonechip, etc? Would it just be a case of cleaning and degreasing the underside(car was recently imported and hasnt seen much wet weather since), then drying out with a heat gun in a garage and spraying the profduct on? Thanks