We have 8155 hours our FL SP135 and she just got broken in.
Here's the oil analysis summary.
Metals are all within the average range. Note that iron has increased a little, but that's a typical finding on a longer oil run. Iron is from steel parts like shafts and cylinders. No contamination like fuel dilution, water, or coolant was found. The viscosity was fine and air and oil filtration look good. Really, some nice trends developing so far. A longer run would be fine, but we like this interval too.