Accord = Castrol Synthetic blend...Costco has a case for real cheap.

Tundra = "Full" synthetic, Mobile one, Costco also has this real cheap.

Everyone is gonna have mixed views about which oil to use, and that debate can go on forever. Basically the only reason why I use the blend is the accord was not purchased new by me, and it's old, and I might be switching it out for another car.

Someone in my class told me, he read a study somewhere where they analyized synthetic and regular conventional oil under a microscope and found conventional to have a gritty look to it, and full synthetic was smooth. Whether or not he is full of it I don't know...but I use that as my basis for choosing synthetic, for my Tundra as I bought it brand new and i'm keeping that truck for at least 10 years.