My wife took the V-Cross in for regular service. They put the empty oil containers in a bag to take home. This time I found a container that has no instructions how to use it or even whether it goes in the crankcase or fuel tank. If they told my wife what it was for, she either didn't listen or ignored it.

 

 

It definitely goes to the fuel tank.

I had similar done at Mazda service (fuel injector cleaner).

That was for a gasoline engine.

They simply filled the small can completely to the fuel tank.

(about the size of a can of coke)

 

Don't know what the correct amount for your engine would be.

 

Is this really worthwhile? As in

• (i) does it work?
• (ii) If so, do the carbon deposits just reform again very quickly?
• (iii) do the carbon deposits really have any impact on the performance of longevity of the engine?

Strange product, clearly for Diesel engines, but also cleans "Spark Plugs" ????????????? 

8 minutes ago, naboo said:

Is this really worthwhile? As in

• (i) does it work?
• (ii) If so, do the carbon deposits just reform again very quickly?
• (iii) do the carbon deposits really have any impact on the performance of longevity of the engine?

i - it will clean something, but better is to change the oil always on time, as well as the fuel filter.
ii - yep
iii - yes, sure.
1.On inlet valve carbon deposits "deforms" the flow of air, creating turbulence. You do not want this.
2.Piston-rings take care of the sealing the combustionspace, if too much carbon deposit the rings gets stuck in their groves and the sealing is less. Thereby less combustionpressure, and less performance.

If you have not used these products from when the engine was new I would not advise it now. Definitely dont put it into a high mileage engine it will only show up the wear on the components which the deposits are effectively sealing now

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10 hours ago, naboo said:

Is this really worthwhile? As in

• (i) does it work?
• (ii) If so, do the carbon deposits just reform again very quickly?
• (iii) do the carbon deposits really have any impact on the performance of longevity of the engine?

It definitely works. Had the head of mine at 70K due to factory recall on head gasket. Others in shop for the same. Mine on FI cleaner since new. No deposits, clean as new. Others had baked on carbon deposits on the back of the valves and a combustion chamber and piston crowns covered in carbon. Made me a believer. Will also benefit in keeping injectors spraying a nice fine pattern.

53 minutes ago, canthai55 said:

It definitely works. Had the head of mine at 70K due to factory recall on head gasket. Others in shop for the same. Mine on FI cleaner since new. No deposits, clean as new. Others had baked on carbon deposits on the back of the valves and a combustion chamber and piston crowns covered in carbon. Made me a believer. Will also benefit in keeping injectors spraying a nice fine pattern.

That is a useful site ... thank you Mr Canthai. However using a decent fuel eg Shell V-Power +   would probably result in the same result... well Shell say it will 

2 minutes ago, JAS21 said:

That is a useful site ... thank you Mr Canthai. However using a decent fuel eg Shell V-Power +   would probably result in the same result... well Shell say it will 

Nissan have also advised me to use Shell v power, General manager told me that they had done test's which proved using the V power was beneficial.

One point of warning before you use v-power in diesel engines.

Not all high pressure fuel pumps in diesel engines are suitable to use v-power dieselfuel.

This fuel is cleaner and has no sulfer. Sulfer is used to grease the pump (as well the valveguides). 
No sulfer means the high pressure fuelpump will wear out much quicker.

Older Isuzu diesel engines (like the V6, but also the 3.0 turbo) are NOT suitable to use with V-power.

I do not know how it is with other brands so try to find out before you want to use V-power yourself. 
People who recondition diesel fule pump will surely be able to tell you more.

All I can say for sure is that Isuzu charged 990 baht for a liter bottle of that stuff. The engine only has 20,000 kilometers on it. I do use STP injector cleaner once in awhile, a bottle and a half for 70 liters of fuel. My wife was upset with me for complaining and told me the next time I can take it for service myself. Maybe I should have kept my mouth shut.

7 hours ago, canthai55 said:

It definitely works. Had the head of mine at 70K due to factory recall on head gasket. Others in shop for the same. Mine on FI cleaner since new. No deposits, clean as new. Others had baked on carbon deposits on the back of the valves and a combustion chamber and piston crowns covered in carbon. Made me a believer. Will also benefit in keeping injectors spraying a nice fine pattern.

 

One wonders how, if it's a direct injection engine, the cleaner (or for that matter the carbon) gets to the cold side of the inlet valve.

 

48 minutes ago, Crossy said:

 

One wonders how, if it's a direct injection engine, the cleaner (or for that matter the carbon) gets to the cold side of the inlet valve.

 

Good point ... at first I thought it may be EGR, but then looked it up ... here is a posted suggestion ...  http://www.underhoodservice.com/direct-injection-engines-develop-carbon-deposits/ ... but I do wonder how that product will remove the carbon from the inlet valve of a Direct injection engine. 

 

And ... 

 

Surely modern fuels have enough additives to render this type of product obsolete ?

Harley Davidson used to sell stuff like that

 

The mechanics called it ring remover

 

Use clean fuel, service regular, keep the filters changed and additives are unnecessary/useless