Toyota and Lexus Engines develop engine oil sludging slowly over time. 2006 Class Action Lawsuit cited Toyota at fault. Toyota agreed to warranty all cars up to eight years from original purchase. Problem: Most issues with engine sludging requires in excess of 100, 000 miles to present itself. Most low mileage drivers do not hit the 100, 000 mile mark until the warranty period has past. Toyota requires extensive proof of oil changes to "confirm" that you properly took care of your automobile's maintenance. Oil changes are the... read full review »