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I hadn't checked for a year or so, so I took a look at the Honda Japan Digital Owner's manual for the Accord. It's mostly unreadable, but if you scroll down you can see that they would seem to be allowing viscosities up to 5w-40 in Japan for the 2.4 litre engine. So it goes. Henry

Now that alll of the over the counter synthetics except Mobil 1 seem to be group IIII, my question is: which ones have the best additive packages? Everyone has loved to hate Castrol for their scamming the word synthetic, but it seems no one's hands are clean now. So, how good are Castrol...