Re bike endurance, it depends upon a) the sooting level and b) the acidity of the oil after the allotted oil change period.
On modern engines the blowby past the rings is very low so the soot carry over is at a level where the oil can hold it at a safe level. Modern fuel has very low sulphur content so the acidity in the blowby is reduced and so the total base number is held within tighter limits - some wear is due to acid corrosion but part of the additive package in the oil is there to combat this effect. The additive package also has viscosity improvers that maintain a closer control of the viscosity over the temperature range and with age which is why the cost of a modern high quality oil is higher and cheap oil can lead to excessive wear, i.e. you pays for what you gets! Interesting to note that about four years before I retired, the target oil change intervals for heavy duty diesels in the US was over 100,000 miles and when I left in 2003 it was engine life (>250,000 miles), the latter being achieved by a special oil top up package of additives at 100,000 mile intervals together with significant improvement in the ring design, cooling system optimisation, liner finish, improved filtration and oil quality. This is not so easy to achieve on a vehicle with a much greater variation within the duty cycle and a lot of cold running such as a passenger car engine. Cold start is where a lot of the acid attack takes place, particularly if the engine runs wet for any period. Hamish ----- Original Message ----- From: Matthew To: [email protected] Sent: Friday, December 05, 2008 12:43 PM Subject: [Quantum Owners] Re: 2+2 oil selection Oil go with that ;-) I personally use whatever it is Ford man gives me for a focus RS Turbo. Seems to be a little dearer than trade factors or halfords. However I'm taking no chances with my latest engine. Spending £40 on oil compared to £50 doesn't seem to be an economy worth skipping on considering the value of the engine itself. I did hear a story a while back (urban legend?) that one of the bike people took two identical new bikes and ran them both for 100k miles, one they changed the oil every 4k miles the other they didn't. At the end they examined the wear and both were near enough identical. Matthew > -----Original Message----- > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of crash test > Sent: 05 December 2008 11:31 > To: Quantum Owners Group > Subject: [Quantum Owners] Re: 2+2 oil selection > > If you were happy before and it's only due to a fault > elsewhere in the system and not due to lubrication failure in > general then why change. > Only my thoughts. > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). -~----------~----~----~----~------~----~------~--~--- ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.9.14/1831 - Release Date: 04/12/2008 21:55
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