HELLO GUYS
IT IS NOT THE STEEL IT'S THE SYSTEM.
DIESEL ENGINE FUMES DO NOT CORODE THE METAL SO MUCH BECAUSE OF THE UNBURND FUEL CREATE A COTING OF OILY STUFF WHICH HARDEN IN TIME AND PROTECT THE STEEL AGAINST WATER
THE SAME THING IT;S HAPENED WHEN YOU BUY A CAST IRON POT WHICH CONTAIN A HIGH CARBON CONTENT WHICH MEANS MUCH FASTER COROSION AND BEFORE USED YOU HAVE TO SEASON FIRST , COAT WHITH OIL AND BURNED BEFORE THOUCHING THE WATER. IN EUROPE WHICH DIESEL ENGINES ARE EXTENDET USED THE EXOST SISTEM LAST MORE THAN 20 YEARS. MY FHATER SYSTEM LAST FROM 1971 TO ALMOST1995 AND HE HAD TO CHANGE BECAUSE OF AN ACCIDENT