My 2003 Accord calls for 5w-20 oil only. I might change the oil more often than the 7,500 mile interval, but Mobil 1 does not offer 5w-20 and I have used that for years. Amsoil has only one 5w-20 that is kinda synthetic. I have found regular oil in 5W-20. Would Mobil1 5w-30 be better than a regular oil that is 5W-20. I would prefer to follow manufacturer recomendations, but would also like to provide my car with a good choice. Any comments would be helpful!