Just purchased a Honda Pilot with 36k miles. Does Honda have my best interest (from an engine longevity standpoint) at heart in recommending 0W-20 weight oil or is this a gas mileage play? I have an Infinity Q-50 as well and there is a range of recommendations for the 3.0l from 0W-20 to 10W-30 (or maybe even 40) depending on climate conditions. There is a lot of debate on the Q forum about whether there is a trade off with the thinner viscosity oils in protection vs just providing less resistance for mileage or performance. Anyway, I would prefer to maximize engine protection and longevity over marginal fuel economy improvements. The car had last been changed at a Jiffy-Lube type place so I immediately changed it to a 5W-20, figuring that was safe at the start of spring/summer in the mid-west. My instincts say 5W-30 would be better long term for the motor but I am not an expert on the topic. What is the consensus thoughts here on the BITOG forum?