I have not changed the oil on what is - I assume - a Sienna with the 2GR-FE (3.5L) engine; however, the process is apparently not unreasonable, since almost everybody does it without having a leak. I certainly wouldn't change manufacturers because of an issue like this.totsuka said:I did mine and it leaked. I caught it real quick, but I'm very disappointed that Toyota makes it too difficult to just change your oil. I take it to the Toyota dealer and pay 60 bucks (Mobil 1). They say they do get vans towed in once and while with oil leaks after an oil change. Usually it's from Walmart and the engine is burned up. I'll not buy another Sienna if they keep this same design or any other Toyota with the same design.
I really have to wonder about a driver who ignores the warning resulting from a lack of oil and drives the vehicle to destruction.
By the way, for $60 including the oil and filter, if I found it difficult to do I would just pay to have it done at the dealership (although I would check their work, since I don't trust them). The oil and filter alone are a very large part of that cost.