Vi riporto delle informazioni maledettamente interessanti a riguardo....sono in inglese ma svelano ogni dubbio ............. a riguardo ....
La pagina sorgente è la seguente :
http://www.carbibles.com/additives.html
Il pezzo che + interessa è comunque questo (la conclusione) :
The current trend is the "90% of your engine wear happens at startup" advertising ploy. This fact is absolutely true, but as it happens, it's less to to with "grinding engine parts" and more to do with combustion. When the combustion gases burn, they form acids which are highly corrosive when their vapours condense. These acids collect in the upper cylinder areas where their temperature is raised above their dew point. The acids condense and etch the cylinder walls and piston rings. In reality, this accounts for over 85% of engine wear, the other 15% being down to abrasion. So the adverts are nearly right - most of the engine wear does happen at startup, and it is because of a lack of oil, but it isn't because the oil isn't coating moving parts - it's because it's not transporting these acidic gases away. Having said that, if you start the engine and let it idle for 15 seconds or so before moving off, you can probably add another 100,000 miles to your engine's life without one bottle of additive. This warms the oil up a tad and makes sure it's in all the most vital areas before you start putting a strain on the engine. Most handbooks tell you not to let the engine warm up before driving off (they're referring to the acid corrosion mentioned above), but they mean don't let it reach working temperature. If, however, you insist on starting up and belting off down the road, think of this next time: it takes an average engine around 3 minutes of average driving for the exhaust manifold to reach 300°C. If you blast off and run around at full throttle, right from the word go, that process takes a little under a minute. Think about it - from outside air temperature to 300°C in a minute - what exactly is that doing to the metal in your manifold? Ask anyone who's ever owned an original Audi Quattro - they'll tell you exactly what happens. I'm not saying that these companies are having us all on, heaven knows there are plenty of statements from companies and private individuals who have reportedly reaped the benefits of these products. But in my experience, it's simply not worth the huge risk of putting the additive in there. Another perspective:
In altre parole conclude dicendo che l'usura del motore che avviene alla partenza (90% usura) è cosi' scaglionata : 85% è dovuta alla combustione e alle sostanze acide che condensano e corrodono le pareti alte del cilindro e il 15% è dovuto alla diciamo ridotta funzione lubrificante del lubrificante...
Quindi se si mette un antiattrito nel motore si toglierebbe al max il 15 % di usura ....(e non come dicono che riduci a 0 l'usura quadruplicando la vita utile del motore)...............inoltre dice che in un olio ci sono già additivi antiusura appositamenti studiati e che le case investono milioni di euro x fare queste formulazioni,quindi un buon olio ha gia' tutto cio' che serve...come additivi antiusura gia' presenti nell'olio faceva riferimento a composti del fosforo e zinco............
Inoltre viene detto chiaramente che quando il manuale dice di non lasciare scaldare il motore da fermo si riferisce a non farlo scaldare fino alla temp di esercizio da freddo (da temp ambiente a 90°), ma sarebbe meglio farlo scaldare qualche minuto prima di mettersi in viaggio .........
(sono contento xchè io l'ho sempre fatto scaldare fino a 45-50° e finalmente trovo un qualchecosa che appoggia pienamente la mia teoria sul riscaldamento da fermo...giusto 4-5 minuti)
e poi chi vuole leggersi altro lo puo' fare,,,,,,
:OK)
La pagina sorgente è la seguente :
http://www.carbibles.com/additives.html
Il pezzo che + interessa è comunque questo (la conclusione) :
The current trend is the "90% of your engine wear happens at startup" advertising ploy. This fact is absolutely true, but as it happens, it's less to to with "grinding engine parts" and more to do with combustion. When the combustion gases burn, they form acids which are highly corrosive when their vapours condense. These acids collect in the upper cylinder areas where their temperature is raised above their dew point. The acids condense and etch the cylinder walls and piston rings. In reality, this accounts for over 85% of engine wear, the other 15% being down to abrasion. So the adverts are nearly right - most of the engine wear does happen at startup, and it is because of a lack of oil, but it isn't because the oil isn't coating moving parts - it's because it's not transporting these acidic gases away. Having said that, if you start the engine and let it idle for 15 seconds or so before moving off, you can probably add another 100,000 miles to your engine's life without one bottle of additive. This warms the oil up a tad and makes sure it's in all the most vital areas before you start putting a strain on the engine. Most handbooks tell you not to let the engine warm up before driving off (they're referring to the acid corrosion mentioned above), but they mean don't let it reach working temperature. If, however, you insist on starting up and belting off down the road, think of this next time: it takes an average engine around 3 minutes of average driving for the exhaust manifold to reach 300°C. If you blast off and run around at full throttle, right from the word go, that process takes a little under a minute. Think about it - from outside air temperature to 300°C in a minute - what exactly is that doing to the metal in your manifold? Ask anyone who's ever owned an original Audi Quattro - they'll tell you exactly what happens. I'm not saying that these companies are having us all on, heaven knows there are plenty of statements from companies and private individuals who have reportedly reaped the benefits of these products. But in my experience, it's simply not worth the huge risk of putting the additive in there. Another perspective:
In altre parole conclude dicendo che l'usura del motore che avviene alla partenza (90% usura) è cosi' scaglionata : 85% è dovuta alla combustione e alle sostanze acide che condensano e corrodono le pareti alte del cilindro e il 15% è dovuto alla diciamo ridotta funzione lubrificante del lubrificante...
Quindi se si mette un antiattrito nel motore si toglierebbe al max il 15 % di usura ....(e non come dicono che riduci a 0 l'usura quadruplicando la vita utile del motore)...............inoltre dice che in un olio ci sono già additivi antiusura appositamenti studiati e che le case investono milioni di euro x fare queste formulazioni,quindi un buon olio ha gia' tutto cio' che serve...come additivi antiusura gia' presenti nell'olio faceva riferimento a composti del fosforo e zinco............
Inoltre viene detto chiaramente che quando il manuale dice di non lasciare scaldare il motore da fermo si riferisce a non farlo scaldare fino alla temp di esercizio da freddo (da temp ambiente a 90°), ma sarebbe meglio farlo scaldare qualche minuto prima di mettersi in viaggio .........
(sono contento xchè io l'ho sempre fatto scaldare fino a 45-50° e finalmente trovo un qualchecosa che appoggia pienamente la mia teoria sul riscaldamento da fermo...giusto 4-5 minuti)
e poi chi vuole leggersi altro lo puo' fare,,,,,,
:OK)
