I recently purchased a 2013 4R TE and after reading this thread I became a little concerned, as I'm sure a few others did. I subsequently emailed Toyota Customer Care with my concerns about rust issues and I just wanted to share the response that I received from Toyota with all of you:
Thank you for contacting Toyota Motor Sales, U.S.A., Inc.
Congratulations on your recent purchase of the 2013 4Runner! We hope your Toyota will surpass your expectations in every way.
We apologize for any concern you may have been caused by what you have seen from on-line forums, because from 2005 on, Toyota incorporated a brand new composite material with better impact strength than steel. It's also rust resistant and much more dent resistant than steel.
The coating processes to the frame was modified to address rust issues.
Each Toyota goes through an extensive rust inhibitor process, which starts with rust-resistant steels coated with a zinc and iron alloy panels. If a small scratch occurs, it helps protect the metal from rusting until it can be fully repaired.
Then the body is fully dipped in a phosphate bath to make sure that even the most inaccessible areas resist rust. A special wax sealer is applied to the corners of crevices of the hood, doors, and trunk lid to help protect rust-prone areas.
Finally, anti-chip paint is applied to the front edge of the hood, lower door panels, and rocker panels to help protect these areas from stone chips and other minor debris thrown from the tires. Lower door moldings also help protect the lower doors.
We have included exterior care information from the Owner's Manual, which is more preventative, below.
Per the Owner's Manual:
To prevent paint deterioration and corrosion on the body and components (aluminum wheels etc.)
Wash the vehicle immediately in the following cases:
• After driving near the sea coast
• After driving on salted roads
• If coal tar or tree sap is present on the paint surface
• If dead insects, insect droppings or bird droppings are present on the
paint surface
• After driving in an area contaminated with soot, oily smoke, mine dust,
iron powder or chemical substances
• If the vehicle becomes heavily soiled with dust or mud
• If liquids such as benzene and gasoline are spilled on the paint surface
If the paint is chipped or scratched, have it repaired immediately.
To prevent the wheels from corroding, remove any dirt and store in a place
with low humidity when storing the wheels
Thank you for choosing Toyota for your driving needs. If we can be of further assistance, please feel free to contact us.
Sincerely,
Darren R.
Toyota Customer Experience
I am happy that Toyota responded to my inquiry promptly. It doesn't totally put my concerns to rest after learning that some post-2005 models experienced some rust issues, but I will be sure to do what some others have posted in order to do the best I can to prevent any problems with my truck. I hope this information helps some others too. Thanks guys!