This just happened to pop in my mind today, different vehicles take different oil weights....but shouldn't current vehicles have clearances and tolerances so tight that there is no need for thick(er) oil like engines of the past? Case and point, Honda recommends 0w20 in my 2006 Accord 2.4, also recommended for the V6 3.0, yet the brand new VW's take a 40 weight? Is it just that their tolerances aren't as tight? Even the new Silverado's take a 0w20, and ford has been using 20 weights in there cars and trucks for years. So what gives?