Honda's do better on thinner oil for some reason.
Well, my Honda would beg to differ on your opinion here. Most recent run was Penz Plat Euro 0W40, previous run was PP 5W20, and first run was unknown- likely a conventional 5W20 (bought with this oil). Iron is the same as the 5W20, but aluminum is lower, copper is the same.. and the PP had a bottle of LM MoS2 in it as well! Mileage did suffer about 3% but the engine is smoother, and look at the TBN retention! J35A7s are known for being hard on oil, and the PPE 0W40 was already over 1K farther than the universal average. I will have the 2nd UOA on this fill with nearly 13k on this oil soon... I pulled a sample but did not drain. We'll see how those wear metals look at 2x the universal average, but considering 0W40 gave numbers with a 25% reduction in Al, 50% reduction in Fe, and 71% reduction in Cu to the averages... I don't think it's a safe or logical stereotype to say all Hondas do better on thinner oil. I would, however, say it is safe to say that a good synthetic will help the wear numbers slightly
, but at 150k+ is it really going to alter the lifespan of the engine?