Subaru legacy b4 can I put 91 fuel into it
2 Answers
No problem and it might run better than on regular. My 2003 Forester ran a LOT better on 89 octane.
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TheSubaruGuruBoston answered 6 years ago
Shouldn't matter. If 87 feels worse there's something else wrong, like maybe dirt/water in the tank that benefits from preventing dilution when you use a higher octane. Better to just never run below 1/4 tank on a dinosaur.