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What type of oil is recommended for a 2004 Toyota Wish? Also petrol. I have switched from 91 to 98 or should it be 95? There is a
huge noticeable difference in performance since switching from 91.

Hi there,
Because this car is a Japanese import, there is very little information available.
It's likely that this car was designed for 91, but that doesn't prevent you using a higher grade fuel if you feel you have better performance. I would say that 10w30 or similar would be acceptable for a 2004 vehicle. If in doubt about both queries, it might be best to ask your local Toyota agent.