| Mineral oils are group 1, bright stock, and group 2. Group 2 mineral oils have almost as good heat resistance as synthetic oils but with half the viscosity which means you have to add twice as much to the gas. Group 1 oils have a low "flash point" which means they evaporate off the hot upper cylinder quickly which leaves less protection. Engine Oils that are fully mineral oil: Amalie Pro 2T : 99% group 2 mineral oil Bel-Ray Mineral 2-Stroke Oil : 90% group 2 Castrol Go!: 90% group 2 Amalie SynPlus: 82% group 2 mineral oil Spectro Oils 2T : 75% group 2, 7% group 1 Yamaha Yamalube 2R : 67% group 2, 29% group 1 PJ1 Goldfire Pro Racing : over 35% group 2, under 30% group 1 Bel-Ray SL-2 : 30% group 2, 35% group 1 Golden Spectro : 80% group 2, ~ 5% group 1 Semi-Synthetic oils: Putoline MX5, Castrol A747, Red Line AllSport (not recommended due to 60% group 1 oil), Lucas semi-synthetic, Royal Purple HP 2-C, Maxima Premium 2, Motul Scooter Expert, Amsoil Interceptor, Amsoil Dominator, Putoline MX9, Motorex Power Synt, Motul 710, Motorex Cross Power, Motul 510, Maxima Scooter Pro, Castrol Power 1 Racing Synthetic oils protect well due to a high viscosity but don't burn well which is why they produce more spooge. Fully Synthetic Oils: Maxima Super M, Bel-Ray H1-R, Silkolene Comp 2 Plus, Silkolene Pro 2, Maxima FORMULA K-2 (7.5% mineral oil), Castrol Power1 XR 77, Motul 800 2T Off Road and Road Racing (6% mineral oil), Klotz R-50 Techniplate, Honda Pro Honda HP2, Motul Kart Grand Prix, ELF HTX 976+, Repsol Moto Racing 2T Synthetic/Castor Oils: Silkolene Pro KR2, Penrite 10 Tenths Race Castor, Maxima CASTOR 927 |