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P1170 = Front heated O2 sensor no inversion (stuck).
means that the signal isn't increasing like its supposed to. Most likely
the O2 sensor is bad. It could also be a short or that the wires aren't
plugged in all the way.
I think you should wait until you know the ambient temp will not go below about 50. If you've ever seen a 20w50 at or near freezing temperatures, it is as thick as honey. This is hard on oil pumps and it take a few second longer for the pump to start building pressure. I think a better choice might be to put in an additive like Lucas or STP. These additives tend to cling to bearings and reduce wear at engine start-up.
The HSE designation refers to a Sport Edition 'Rover, not a higher-priced premium edition. Changing fuel grades can harm an engine that doesn't have computer controlled valve timing. Symptoms include a pronounced, fast "knock" (usually when you go from 93 to 87 octane) and using a fuel with a higher octane rating than the vehicle requires (example: 93 versus 87)
sends unburned fuel into the emissions system and catalytic converter.
This puts stress on the emissions system. For some vehicles,
a rotten egg smell or a pop when the fuel burns off in the catalytic converter coming from the tailpipe signals use of higher than needed
octane gas. More info on your problems here, as well as useful links:
I have a 1999 Rover with the 4.6. I bought a code reader for $150 and erased the code. Its paid for itself a hundred times. Did you fix the reason the service engine light problem first? Some auto part stores will read for you. I don't know if they will reset it for you at the same time. If problems not fixed the light will reappear in a very short period of time. Let me know if I can answer anything else. Good luck