I do mine every 3 years or 50,000 miles,wichever comes first! And I switched to all Synthetics at 5-7,000 miles when new and will do again at 55,000 miles and every 50,000 after that,the Brake fluid,Power steering fluid,Tranny fluid,and axle Fluids! and I do the engine Oil in synthetics only and every 10-12,000 miles with any brand name synthetics 100% all synthetic! I use AMSOIL and also recommend Mobil 1, Castrol , Motul , Royal Purple , Red Line , Quacker State,Valvoline, Pennzoil ,Havoline,and many more as long as BRAND Name!and must meet specs!