Sorry but I don't get the point of this thread. I have my fireproof boxers on on please feel free to flame me all you like.
To my simple and addled mind the original post explains how to trick your car's fuel injection system into thinking the engine temp is higher than it is. In that condition it will stop being in 'rich' (aka 'lets warm this sucker up asap') mode quicker than otherwise and so it won't inject more fuel than is needed.
After this mod your car also won't overheat because, er, the thermostat kind of dictates that and keeps everything cool from that point on. And thats a mechanical thing not really computer controlled because, well, why would a car maker do that when a thermostat is such a cheap, reliable and if not working it is a failsafe device ?
Most car makers (Daewoo and their plastic manifolds excepted) are not that stupid.
Then a couple of people noted that well actually not doing this mod and actually driving your car will also make it warm up quicker, and (gasp) it will detect a warm engine and therefore not be in 'rich' (aka 'lets warm this sucker up asap') mode for very long. Which saves some fuel.
They will probably be OK. Their oil light goes out and they go for it which is probably fine, as long as they have a non-return oil filter (so the oil is not coming all from the sump which takes time, even if the system is pressurised). for most modern engines or where you don't buy a 1 quid oil filter that will be fine.
So why mess with your car's FI system ? Why mess with additives of any form, gas or liquid ?
Petrol doesn't burn. Honest. Its the evaporate of petrol that burns. You have to get it to evaporate to explode it. Compressing works as that heats it up lots and very quickly, which is what an engine does in the 'squeeze' bit. Atomising it into a fine spray also works as it increases the surface area to evaporate which is what the FI system does, or indeed is also what an old carb does. But a big help is warmth. Like a warm engine. Which is why your engine has a 'lets warm this sucker up asap' mode in the first place.
Mind you of course running lean in a petrol engine doesn't have any bad effects at all does it ?
So why do this ? If you mess up your car no longer runs and you end up having to repair or replace an ECU - mega spendy.
If you buy some decent oil and a quality filter (not much spendy each time) you can drive straight away on startup and warm up quicker. Block your grill in winter then you warm up even quicker as well and still don't overheat thanks to that thermostat magic.
AFAIK adding Diesel to a petrol engine makes it cough and smoke a bit until it is gone but no damage. Doing the opposite is bad as petrol of course disolves oil, so it wrecks the diesel pump for a start and costs a fortune to pump it out when your GF uses the wrong pump. Guess how I know
