Regina, no hills, no extended idling on congested freeways. Cold weather keeps excessive temperatures to a minimum. Unless the oil smells like petrol, I can't think of a reason why possibly you wouldn't be able to extend.
I think Kramer equipment up by Buck's Auto Parts/IPSCO has UOA services. Not sure of the terms.
Thanks To Pitzel, I got a UOA from Finning Cat (formerly Kramer Cat), they were cheap, fast and local. The results look fine to me for the questions I had that were the purpose of this thread, but I will post the UOA in the UOA subforum.
thanks again for all the suggestions here. I have kept track of the miles at time of oil change this time and will use that and the oil life indicator to decide when to change oil next.