I read somewhere that such rings lasted 20 to 30 times longer in IC engines than those in steam powered ones. On the face of it, it would suggest that the lubrication oil as delivered to steam loco cylinders was woefully short in quantity that would be required. Granted that if much larger quantities were supplied some drastic re-thinking of the oil separators in the steam line to exhaust steam injectors would be required. However, when one reads of the likes of 9Fs and 'Britannia's' needing replacement rings after only 5000 miles, yet lorry-sized Diesel engines being capable of running for 500,000 miles due to improved lubricants, it does give food for thought. Discuss.