My sister-in-law now has both a 2005 and 2006 that I recently become the chief care giver for. The 2006 is approaching 110,000 miles and I recall from someplace, that that was the mileage the book said to change the plugs. However, I can not now find that maintenance recommendation in the manual but I have found on Prius Chat 100,000 and 120,000 for other year Gen 2 Prius. Questions: What was the original recommended plug replacement mileage for the 2006 Prius? And did earlier or later Gen 2 models have different mileage, plug and gap recommendations? Also, If the recommendations changed and the engines did not then would it be better to use later year Gen 2 recommendations. Thanks Fred14
http://www.toyota.com/t3Portal/document/omms/06ToyALLMS_MS0012/pdf/06omsour/2006/schedmai/61w1smt.pdf is the 2006 guide, it states 120,000 miles on page 24 to replace plugs http://www.toyota.com/t3Portal/document/omms/05ToyAllMS_MS0012/pdf/01omsour/2005/schedmai/51w1smt.pdf is the 2005 guide, it also states 120,000 miles to replace plugs, but does so on page 22
