Toyota Sludge Monster V6 with 3,000 mile drain interval on mineral oil.

[Mitch Alsup]

I happen to have 3 vehicles that are known sludge monsters (Toyota). I have kept these on no-name dino juice (5W-30 and/or 10W-30) at 3000 OCIs for 5-7 years. None of these cars has developed a sludging problem.