[QUOTE=jackd;17577112]Sludge trap half full was it? I used to read on the Brit Bike forum about how guys were finding their sludge traps squeaky clean in the modern era of lubricating oils, when they were going in for a look - the assumption was that the modern oils kept the crap in suspension until the next oil change. 100K miles is very impressive service life - you two must know what you're doing.[/QUOTE}
That was run on Castrol 20-50 dino oil the whole way. It IS fitted with a Lockhart oil cooler. Did you notice the logo stamped on the crankshaft? That is a big reason why it lasted so long. That, and my buddy rides it gently, rather than a hammer.