I'm no mechanic...but I've always gone with whatever the manufacturer recommends. I'm always afraid of voiding warranties, or simply adding to wear.
In your case, I think it's safe to say you are probably good until Spring. I'm assuming the engine break-in was done according to Owners Manual...and you are operating on clean oil (not break in). If not, I'd change it right away.
A little overkill on oil changing will never hurt...IMHO.
Pete (Jolly Mon)
2014 Jayco Whitehawk 24 RBS
2004 Nissan Titan LE, 4x4