Royal Purple has come out with a new state-of-the-art fuel system treatment that cleans injectors, restores fuel economy and reduces both engine buildup and tailpipe emissions.
Max-Clean’s technology targets both the intake system and combustion chamber and is effective on the entire spectrum of engines on the road, whether they are new or old, gasoline or diesel, naturally aspirated, turbocharged or supercharged.
Improved fuel economy an average of 3.2 percent, increased horsepower an average of 2.6 percent, reduced hydrocarbon, nitrous oxides and carbon oxide emissions on average of 12, 13 and 18 percent respectively.
Added benefits of Royal Purple’s Max-Clean fuel system treatment are reported as preventing rough idle, hesitation and stalling. Max-Clean is credited with preventing premature spark plug fouling and reducing deposit-related engine knocking and pinging.

I think this is one worth checking out. You should put this in your vehicle every 6 months to a year. This is a new product that i am just making awareness of it and it's benefits. Many people don't even think they need to add this to their car. Many people take their car to the dealer and expect the dealer to do everything. Dealers don't regularly add this or regularly change PCV valves (every 2-3 years is good for PCV).