I cant comment on the Renegade aspect of it but, Halfords look after my daughters car mot/services/brake pads for life etc. She is always happy with the service. I had reservations I will admit but so far they are unfounded.
...then I'd be the one doing the oil and filter changes. That way I'd know it's a) done; b) done right; and c) done using the correct oil specification and filter.If it's out of warranty and just needs an oil/filter change
That's what I'm understanding too. These Renegades are so complex and so quirky, that even traditional Jeep dealers (here in the U.S.) are sometimes stumped by them. I'm not sure the diagnostic tools are widely available.If it needs anything more, then find a good local Fiat or Alfa Romeo independent specialist for engine/gearbox.
It the 4WD needs attention then it'll be a Fiat or Jeep dealer job.