Killer oil!

[2007tRD]

You are absolutely correct about starting on synthetic too early,the engine requires the factory filled high detergent oil for break-in.I extensively reserched the sluge issue,and every source points back to my first post,...change your oil every time the maintenance minder light comes on.pay no attention to what anyone says regaurding changing your oil at 3000 or 5000 miles,as those are just industry standards...not Toyotas.The maintenance minder system caculates by its own milage interval.sludge is caused by water in the oil,it gets in there via condensation everytime you engine is shut down and the oil temp drops below 212 degrees farenheit.the longer the same oil is used the more water accumulates,this is while oil shoud be changed once a year even if the engine is never started.