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High octane fuels will only increase the performace of your cash turning into trash.
High octane fuel contains less energy than regular. Most gas formulations gain octane through ethanol, which has a lower energy density than gasoline. High octane will only improve performance if you engine is built to use it (i.e. higher compression). A high compression engine running regular is going to detonate or run poorly as its timing is advanced.
Stick with the lowest weight synthetic your user manual suggests. Since you own a hybrid, it will probably be a 0W20. If it is a 0W30 or 5W30, you could take the chance and run 0W20 for decreased viscosity, but you'll be tempting fate.
A synthetic oil (e.g. Mobil1) will last 10,000 miles between oil changes. If you want to be cautious, oil analyses can tell you exactly when your oil is losing its rating.
- LostCause
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