To be honest with you Bill I do not think anyone should ever use a dino 5W30 in a Toyota!! It just does not make for a happy union! I will reluctantly agree to 5W30 synthetic in a Toyota but only for winter use! Every Toyota I have ever seen run on 5W30 has either ended up sludged up, varnished up, or an oil burner!
For Spring up to the very begining of wintetr I like 10W30,10W40,5W40,0W40,15W40,15W50,10W60 as prefered weights for Toyota's! IF it is dino change it every 3000 miles if it is synthetic change it every 6 months of 7500 miles. I think the best products are going to be synthetic 5W40 or 0W40 as they offer year round protection.
From 1971 to present we have used either dino 20W50 in warm months and 10W30 dureing the winter months or Synthetic 15W50 dureing the warm months and 10W30 dureing the winter months. We have never had a Toyota that problems with sludge or oil consuption. We have never worn a Toyota engine out either! I have recently tried 5W40 last winter and it worked wounderful. I have M1R 0W30 in right now.
I did not notice any sludge issues or oil consuption issues as wide spread until Toyota went to 5W30 being the recomended oil and they increased the oil change interval.
[ February 17, 2005, 05:20 PM: Message edited by: JohnBrowning ]