Has anybody got some official info on whether semisynthetic of full synthetic oil is best for the new V6 Prado, 1GR-FE engine Pennzoil suggests Semi-synthetic 10W-30 and one of their distributors reccomended full syn 5W-40. Castrol suggested semi-syn Magnatec 10W-40, but for hard work incl., towing a full synthetic Edge Sport 5W-30. Can anyone help please Bruceb