Three problems related to engine oil leaking have been reported for the 2001 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Toyota Sienna based on all problems reported for the 2001 Sienna.
The vehicle experienced an oil leaked.
After my engine registered "low oil", the mechanic found significant sludging. It was flushed and changed and then in <1000mi there was no oil again. Now Toyota says the leaks around the valves are due to my "neglect" in changing oil. I have the receipt from 4 mos ago for oil change. I also was told they would not consider paying for it because it was my lack of oil change that "caused" the sludging (despite my receipt) and that I needed all my oil change receipts for them to consider a claim (2 1/2 year old car. ).
Initially oil leak after oil change. Was told that transmission pan was leaking and paid for replacement. Transmission fluid then started leaking. Returned vehicle to dealer; transmission pan was tightened. Noticed fluid still leaking; returned vehicle to dealership. Dealership could not detect source of fluid leak; placed die in oil and transmission fluids; asked to return vehicle in a few weeks. Returned vehicle to dealership; was told there was a leak surrounding engine seal and seal would need to be repaired.