[Ernest72]

Originally Posted by JIM THEO

Have you ever seen your throttle body interior not to mention your direct injectors?
They are full of smoke and carbon deposits, that's why Subaru calls for injector cleaner every 15.000kms, at least in my area.
I use every 10.000kms HKS DDR which is the most potent hyper polyether amine (PEA) product in the market and what Subaru uses in Japan:
https://www.hks-power.co.jp/en/produ...ddr/index.html

Subaru PEA injector cleaner K0879Y0010:
https://shop.r10s.jp/taxnerima/cabin...sti2/k8079.jpg

I get it. But with thousands of miles of Acura’s, Subarus and old fords, this has never been an issue. Maybe clean gas is the reason here in the states. There is no harm, I remember some people on the bob is the oil guy forum recommended the Lucas oil injection cleaner. I tested it and it did give me about 1-2mpg more, but with the cost was really a wash. Every once in while if it’s on sale I’ll get it and run through the cars. But I really can’t say it’s obviously doing anything.