My STI uses Rotella and it rarely gets driven, so after 12-15 months, the oil usually has 1500-2000 miles.
Thanks to the fumoto valve, I drain it cleanly into a jug, and then use that oil on whatever, I call it Mobil Dos.
Typically on my WEN generator, or use it on my Honda (new 0w20 mixed with a quart of Rotella).