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In my experience, only those using the ULV fluid are getting the intermittent harsh shifting. I think it has to do with the low viscosity designed for MPGs vs Performance as I have been using their Blue Cap Signature series fluid for the past two years with zero issues. The Amsoil ULV was not available in 2023 when I bought my car, so I have stayed with what I found to work and was suggested by Amsoil in Feb 2023. It is also what I use in all my customer's cars with zero issues.
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