Quote:
Originally Posted by 1engineer
It does get confusing. It all starts with base stock. Difference between full and blend is simply additive packages. Mobil1 is fine.
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Actually, from my understanding the base stock is the difference. Depending on who you ask fully synthetic oils start out from a group III, group IV or group V base stock. Some oil snobs would only consider a fully synthetic oil to come from a PAO base stock of group IV or V. Group III is similar to Group II but has higher viscosity indexes. Nothing wrong with a oil from a group III base stock
Semi Synthetic oils are a blend of Group I, II or III base stock with some group IV or V mixed in but you never really know how much.
Semi synthetic oils are fine, hell, conventional oil is fine if you keep it changed. I have researched the hell out of oils to figure out what would be best for my 4Runner and decided to go with the Toyota branded full synthetic. I am an Amsoil loyalist but decided to go with Toyota this time
Since I am sure somebody will I will just come out and say correct me if I'm wrong