Add transmission fluid to engine oil?

[bronsin]

Originally Posted by jambo101

A 2010 Yaris is a bit young to be having internal problems, i'd leave this kind of cleaning till the car actually needs it,which maybe never.

In my experience the engines Ive owned that Ive taken apart to rebuild (VW Beetle and Bus) were just tanned a little inside the crankcase. No buildup, sludge etc at all. I changed the 2.5 quarts of oil every 2000 miles and commuted to work 30 miles away.

I dont know what to make of sludge buildup in the engine. They claim to have changed the oil.

Now that I drive my Yaris 3-4k miles a year with mostly 6 mile trips the oil comes out clean every six months...