Originally Posted by SIdogg
On my '03 Si, local Honda service tech advised against using synthetic, but to use standard mineral oil on this model, suggesting it's best for all Hondas (Acuras). Told me that Honda does not recommend synthetic oil use in its motors. Is this just a company line, or some fact?? Sounds like a lot of Hondas, esp. those used in high performance, use synthetic regardless of age.
Your dealership tech has no idea what he's talking about (maybe due to the fact that he's a technician and not an automotive engineer?). Synthetic is perfectly fine to use and in fact will provide superior performance over dino oil.