To change the plugs on the V6 they need to pull the intake manifold to get to the driver side plugs, so it's a bit more work and parts than in the old days. If you had a misfire, they should have also checked the coil packs and injectors. No way you should have needed new plugs at 60 000km...
We have a 2016 V6/3.21 and a 2000 lb trailer. No problem towing, we went across Canada this summer, no issues, but it downshifted a few gears on the long inclines north of Lake Superior. The 3.55 would probably hold a higher gear on some of those hills, where ours would sometimes hunt on the...
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