Service life of injectors?
 

What's the best thinking on estimated service life of fuel injectors on a 955 Turbo? I've read conflicting information - some say they degrade and the spray patterns degrade once you get around 125K miles. Others say so long as you use good fuel and periodically use some injector cleaner in the gas, and confirm correct electrical resistance, the injectors should last the life of the vehicle. I'm sort of leaning toward the notion that these are wear parts at some point; I'm just not sure at what point that becomes true. Thoughts?

You could have them cleaned and flow tested by someone like https://www.rceng.com/Fuel-Injector-Cleaning-P43C0.aspx

I would say when you start misfiring or having issues. Plenty of high-performance german cars with 200K+ miles and original injectors. It's not something I worry about, personally. I get gas from Costco, or wherever is convenient. I've never had an injector issue on any of my cars, and most were sold with 200K+ miles.