Castrol Magnatec 10/40

[Shifu]

So at what period would you carry out your oil analysis. If you did your test at say recommended oil change interval (6000 km), and given that as you say oil filter technology has made little progress chances are you are going to be changing your oil and filter and paying $45 dollars extra to have a boffin tell you you need to plus the inconvenience of having it tested on a engine you may only be using for a couple of years before selling. How does that save money when you can cut out the oil test and just change your oil and filter ?? Engines now are capable of doing lots of km/s or miles on manufacturers recommended service intervals. I think Greyhound buses do over mil before they are even stripped down. (That was what I was told when I was living in Canada a few years back). Bikes in here have done well over 100,000kms no probs, Dunno what Tex clocks up on his, must be a huge amount.

Mate, your logics are flawed here for the following reasons:
Firstly, you do oil analysis only to establish the oil change interval for a given oil. You change it once the lab will say that the oil is used up - the lubricating properties had detorierated because of the chemical breakdown of additives, PH drop etc. So you get maximum value for the dollar spent on a given oil. Then you can stop analysing. Most of us, I dare to say all of us, change the oil long before that end of its useful life is reached. The main reason being that it is dirty (like Throwdown describes for example). Why the oil gets dirty? Or in another way is that metal can attached to the engine and called "filte"r is doing there? Shouldn't it keep the oil clean?
Secondly, the issue of the long mileage of buses you are mentioning. Volvo trucks will do 2.5 million miles before they need a rebuild! And that are hard work sometimes 16-18 hrs a day. The oil they use is not a special NASA edition but very much the same oil as you do in your bike. And they do not change that oil at 6000 km but 30000 or in some cases 500000 km. And that is determined by analysing the oil. By the way the results can also tell you a lot about the state of your engine (another topic altogether). Now ask youself the simple question - how is that possible?? Hint to the answer - Have seen their oil filters?