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Can I use the 75/90W Royal Purple MT fluid? I used it in my Matrix but can't find the weight/viscosity for the SI.
 

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2017 Honda MT fluid 5W-30 Amsoil

Doublecheck before you change. I just did my 2018 Civic Hatch Sport 1.5 Turbo 180 HP. I used Amsoil 5W-30 (MTFQT-EA). The Amsoil site indicates that this oil is backwards compatible to Honda OEM fluid. After 1,000 miles I noted the smoother shifting everyone raves about. This is a very light fluid compared to a 75/90W gear oil.
 
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