I've had the old flush done in 2017 at 8000 miles and again in 2018 at 12000 miles. Put almost 2000 miles since flush in April 2019 and I've not noticed the shudder. I noticed a weird, I think, 2-3 shift occasionally but I've done several long trips where I consistently had the shudder before and it has not come back. Fingers crossed!
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