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      04-08-2016, 06:37 PM   #8
Private First Class

Drives: Z4 E89
Join Date: Jul 2015
Location: South Carolina

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Originally Posted by ljkiter View Post
I did hear about the 3,000 rpm for deposits but thought it was just for diesel?
Normal mode is also economy mode and so it keeps the car in the highest possible gear as much as it can (DCT). Direct injection is notorious for causing deposits because the fuel does not wash over the back of the valves but goes straight into the cylinders. The back of the valves get deposits somehow from oil. Again google DFI deposits. Using higher revs is thought to help keep down deposits. I hope gasoline additives also help because the cures are messy. Toyota even injects some fuel ahead of the dfi to avoid this.
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