offical answer from subaru faq:Q: My Subaru’s maintenance schedule includes an Upper Engine Cleaner to be performed, what is this? A: Engine power output is created by the burning of fuel in a vehicle’s cylinders. As petrol is a hydrocarbon fuel, made up of hydrogen and carbon, after combustion it leaves carbon as a by-product or deposit. Over a relatively short period of time the carbon deposits on the walls of the combustion chamber, the piston crown (top surface), and on the valves, can result in the deterioration of engine efficiency. This may lead to poor fuel economy, reduced power and harder starting.
To overcome this situation, the factory has formulated ‘Upper Engine Cleaner (SA459)’, which is a concentrated combustion chamber and induction system cleaner. This product helps clean and purge gum, varnish, and carbon deposits. Using this solvent during scheduled servicing has proven to be a valuable form of preventative maintenance.
If your vehicle were subjected to regular stop/start driving, short trips, or poor fuel quality, the build up of gum, varnish, and carbon deposits would be far more rapid. In addition to ‘Upper Engine Cleaner (SA459)’, we suggest the use of ‘SA718 Fuel Additive’ to maximise your engine’s protection against such concerns.
Both products have been specially formulated by Fuji Heavy Industries, the manufacturer of your Subaru vehicle, to be compatible with the Subaru horizontally opposed engine and it’s technically advanced electronics. These products are available through all authorised Subaru Dealers. 作者: 龌龊淡蓝色 时间: 2010-12-16 00:42
哥们也开subaru?作者: funnykuma 时间: 2010-12-16 04:34
you are right作者: 蓝桥翼 时间: 2010-12-16 05:09
我也去AUTO BORN买了瓶类似的东西,但是不知道怎么用,怕乱用坏了车,下次还是拿到33那边去给他看看作者: fckya 时间: 2010-12-16 08:05
之前每次去subaru做service都有这项清洁,subaru主要是保养太贵,一年要做两次,其他新车基本上一年一次,宝马一年半一次,不明白为什么subaru那么娇气,车是好车。。。。。作者: younggun 时间: 2010-12-16 08:13
what is the name? how much is it? although I do not have subaru, I am interested in it.
if you can post a pic, it will be better作者: younggun 时间: 2010-12-16 08:18
I think it is beacuse it box engine. it is horizontal. not like the vertical one, where all the dirt and slug will easily go to the bottom and drain out, all the dirt will stay almost whatever it is. if you do not serve it frequently, it will easily die.
further, how much is the service?
Thanks.作者: ACE23S 时间: 2010-12-16 10:43
引擎没有什么毛病就不要乱清洗这个那个的,就按时换所有oil和filter就好作者: younggun 时间: 2010-12-16 10:52
really depends on the car作者: fckya 时间: 2010-12-16 19:19 回复 10#younggun