I saw that you had answered a question about carbon build up and piston repair on IS250. I have a 2007 IS250 with 43,000 miles and took it to dealership with check engine light and rough idle. I only have had the car for 1 year but it was regularly serviced at Lexus dealership before and after I got it. I was not low on oil, I don’t know if it got premium gas all of its life. The Dealership told me that it was carbon build up and already replaced my pistons but I am concerned that it may happen

again after warranty. They said it was a “permanent” fix. I would like to keep the car a long time but I have a few questions:

1. I was told by others that I just need to do “injector service” once a year. Can I really avoid the problem again by doing injector service once a year or do I have to do soak procedure every year?


2. Why is injector service or soak not recommended maintenance?


3. Is my engine life expected to be shorter now that I have had carbon build up and they had to replace the pistons?

Thanks,

Lonnie

Country: United States
Make: Lexus
Model: IS250
Year: 2007