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"all of our roller bearings are fine"
I love this meaningless self serving comparison that doesn't account for installation differences, pre-installation engine condition, age of the bearings, miles on the bearings, owner driving habits, driving conditions, oil change habits/products, etc.
Show me one seller of a specific kit that doesn't say mine is the best. Show me one kit that has had adequate testing/sampling. As I often say, Porsche got it wrong several times with all their 100k miles test mules.
Come back when you have ten million miles of sample data.
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