Originally Posted By: friendly_jacek
Originally Posted By: The Critic
Was on cars.com the other night, found three 2010 Prii with 120-130k miles. Out of curiosity, I checked the service history on all 3. Two out of the 3 had a dealership visit right before they were traded in, and it was for oil consumption. One was consuming 1 qt every 1000, the other was consuming two quarts every 1k according to the customer. One had documented 10-12k oil changes with Toyota 0w20. Hmm....
12,000 miles was clearly too long BTW. But I always believed that there was a trade off between fuel efficiency and wear protection. I decided to go to 5W30 when warranty expires in my prius. Same with the transaxle oil, WS ATF that shears down to 4.7 cSt is too much for my taste. Especially in my hot climate.
All of the Prius 0w20 UOAs that I've seen show the oil to have plenty of life left at 10k - so I seriously doubt that going an extra 2k would cause any long-term harm.
I too, may go with 5w30 once my warranty expires in a few months. I'm at 53k right now. I recently took a trip to Southern Ca and the engine was working extremely hard over the hills (4k+rpm, it seemed) and I did burn thru a little bit of oil during the first 1k of the trip, but the oil level has remained steady ever since.