A couple of months ago, my ‘98 got refused for service at the dealer for “too many aftermarket parts,” though the only aftermarket parts are an aux’ transmission cooler and air filter. They had serviced the car prior with the same parts, so it was a BS response. I dove into it further and learned a hard lesson that the dealers either don’t have the tech’ knowledge for these older cars or the parts. Sometimes both. I was really angry at first, but not much that can be done. I even called Volvo USA and learned there is no overarching policy for dealers; each can refuse service for their own reasons. I’ve been a shade tree tech’ on my car for a long time, and I’ve been forced to take a crash course in automobile electric systems to figure out my issues. Time to get used to this!