I do not understand the logic that it is there way to get off cheap on maintenance.
Think about this for a second -
2yr 25k on 5k intervals = 5 oil changes, not synthetic oil - $200
2yr 25k on 10k intervals = 2 oil changes, synthetic oil - $160
Now, think about over 100k miles -
75k on non synthetic - $600 in maintenance costs for the dealership
80k on synthetic - $640 in maintenance costs for the dealership
Now, add them up -
100k on non synthetic - $800 total revenue
100k on synthetic - $800 total revenue
So, over 100k miles on dealer service, which quite a few use (we forget that just because us on these forums are generally handy, the vast majority of people aren't) the maintenance costs are the exact same for the dealership doing the service. The cost difference in lost revenue for the dealerships is only about $40, but the cost for materials for the synthetic 0w20 to the bulk 5w30 used is significant. Not having the exact numbers, I would say that it actually costs Toyota more money to do 10k synthetic jobs than it does 5k non synthetic jobs. This would be due to the opportunity cost (two non synthetic oil changes bring in approx the same as one synthetic, with a lower material cost, thus a higher profit). Now, this is not touching the fact that if this was too long of an interval there could be engine damage, resulting in significant cost for Toyota.
Toyota does not do 10k intervals to save cost on their 2/25 service plans, that is asinine. They do 10k intervals on 0w20 because the oil is good for 10k intervals. Don't believe me, again I say, do a UOA at Blackstone Labs. You will be surprised to find that the oil has plenty of life left.
:snacker: