Thanks for the quick response. I meant I am a simpleton, not necessarily looking for a simple fix. But, as you state: will try the HPL cleaner in the 4Runner first, since I can see some deposit. As for the Sienna, it’s clean and problem-free. Might try, after reading so much about it here, HPL...
Have been aware of BobisTheOilGuy for a while, and seen excerpts from tests, reports, etc., but first time registering and digging into the site. This is a great resource!
2 Questions: one regarding an owned-from-new 2012 Sienna, and one regarding a newly acquired 2000 5-speed manual SR5...