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No american would want to leave the oil in their sump any longer than 5-7000 miles or so, let alone 12.
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>>These ridicuously long service intervals are to satisfy fleet managers who only condsider running costs. Honest John has repeated this many times in his column.
He has also said that the new, more efficient oils, do not allow the engines to wear in the early days as older oils did. This is apparantly why they continue to use oil.
That being so, then surely this would mean that oil change periods *CAN* be longer and also, given that HJ's advice is also never to change the first oil too early because its better for the engine to wear in, means that oil changes *SHOULD* be left longer.
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Please dont shout Mark, I'm not stupid. I agree that newer oils are more efficient. This can be taken to extremes though and 12k miles is far too long to leave oil in the sump.
As part of my job, I take oil samples from the plastic processing machinery I work on and send it for analysis. This is to determine when it needs changing (Average machine has 100 gallons in so we do not want to do uneccessary changes). The point being that even clean looking oil can be very contaminated with various metals, acids and varnishes. Also, this gives early indication of any components starting to fail. Obviously, I'm not advocating car owners do this!
New cars and bikes are usually filled with mineral oil for bedding in as synthetic will prevent proper bedding in. The motor should be fine however for synthetic after about 5k miles.
When a new engine is bedding in there is all sorts of debris being pumped around the engine. Do you really want that for 12k miles or longer? It is like having grinding paste in the sump. Also, don't assume the filter is collecting all of this either.
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\"Nothing less than 8 cylinders will do\"
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