When I got the 164’s (I bought two of them) I was putting 600 miles a week on them and did that for about four years. I used them like a tag team, when the black one came due for an oil change or any sort of maintenance I’d start driving the red one. They both still run great but I don’t use them much anymore. I should let them go (or at least the red one) but it’s got the Recaros. It’s like choosing to disown one of your sons over the other.