Don't like the time between oil changes

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Dave Plowman (News) wrote:


BMW oil is "long life" but if you're really not happy then just get an oil change half way between services and don't have the lights re-set /ecu fiddled i.e don't tell the car its got new oil :-)
Someone (must have been a mate of a mate/ down the pub) said that some makers have longer times/distance between oil changes for the UK market as it looks good (pence per mile) for the large fleets who only care about the costs for 3/4 years and sod the owners down the line - don't know if thats true but it sort of sounds right
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If it was, how about the oil and filter makers who are having *their* business cut? I think they would have something to say on the matter if it was the case.
And BTW, when did you last hear of a worn out engine in *any* car? Sure they can break cambelts and blow head gaskets, but ones needing a re-bore and crank grind?
--
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:

Basic common sense. The purpose of oil is to lubricate AND suspend particles. Filters have improved but still will not remove all the particles and dirt (there is a reason why new oil is brown and clear while used oil is black and opaque). Only changing the oil will remove them. I have one car that does not use synthetic oil and I change that oil every 3000 miles. Of course there is now 150k miles on that 4 cylinder and it still runs great, passes smog and burns no oil.
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Sorry to intrude on your religious war, but you might find the website bobistheoilguy.com helpful. I bet you can find a used oil analysis on a BMW that includes Total Base Number and particulate analyses, which might be helpful in determining appropriate oil change intervals.
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Except the base number would change depending on the driving conditions. I bet the number will change for the same car driven in the same environment if the analysis is taken at different times of the year.
One thing did prove my point however. According to the site, if dirt is found in the oil it as the result of the air intake system (dirty environment), oil filter plugging, oil filler cap and breather, valve covers, oil supply. Since it is found in the oil, the filter failed to remove it and only a change will solve the problem.
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Then change your oil every 1000 miles. Oh - and the gearbox and final drive oils too. They wear out as well. And at the same time since you know so much better than the makers how about safety items such as brake fluid? Best to change that every other tank of petrol. And the coolant and battery electrolyte too. You can't be too careful.
--
*Keep honking...I'm reloading.

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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On Thu, 07 Dec 2006 00:18:09 +0000 (GMT), "Dave Plowman (News)"

Well, I don't know about you, but I drain the fuel tank of that nasty old *yesterdays's* fuel, and fill up with fresh every morning. I definitely notice a difference in something, I'm not sure if it's the car's performance or the weight of my wallet.
--
Dan.

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Dean Dark said

Don't forget to change the air in the tires from summer-air to winter- air! It's critical - I understand. ;-)
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Do I detect an ever so slight hint of light sarcasm on the part of Dave Plowman and you here...?....
DAS
For direct contact replace nospam with schmetterling
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On Thu, 7 Dec 2006 21:51:45 -0000, "Dori A Schmetterling"

Damn. There's just no sneaking anything past *you*, is there?
--
Dan.

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Actually I had a friend who had an old bug-eyed sprite who did just that (replace every 1000 miles). Say what you like but one of the purposes of oil is to suspend dirt and other contaminents. If you want those floating in your engine then change it every 15k.
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What do you suppose the filter is for?
Look, if you want to change your oil and filter every week, go ahead -- whatever makes you happy. It's your car and your money.
But quite treating the matter like a religious war, when you seem totally ignorant.
-- Larry
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It's just common sense Larry. Filters don't catch everything as evidenced by the data in the web page mentioned in an earlier post. BTW, just returned from having it changed. Will do so every 5k from now on as per the shop's owner's recommendation.
Thanks for caring.
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So long as they are changed regularly (i.e., not forced into using the overflow) they catch everything down to some number of microns in diameter, depending upon the individual filter's design and quality. I would think your concern -- and your money -- would be more rewardingly applied to studying available filter evaluations and picking a particularly effective oil filter.
Or maybe you need to install a dry sump system with additional filtering or a design which will allow those suspended particles to fall out of circulation.
Not to mention the fact that you might also need to obtain purity information on the particular oil you're using, since it might already contain suspended particles approaching your size of concern. 8;)
I happen to change my oil and filters every 3-5K myself, but my cars also spend considerable time at autocrosses and racetrack days, and I'm a fussbudget. But I acknowledge that that is probably a great waste of money.
-- Larry
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I spend a good amount of time in traffic where the mileage may not be a good indicator of run time. I think it is money well spent.
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It is certainly less than what you would spend on a psychoanalyst to deal with your anxiety about not changing oil and socks every 3000 miles / 3 h...
DAS
For direct contact replace nospam with schmetterling
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And he knows better than the makers? And of course has no financial interest in his recommendation...
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*Born free...Taxed to death.

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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wrote:

Changes the oil every 5k in his own Z4 and MiniS.
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Most auto manufacturers of that era (1950's) called for oil changes every 1,000 or 2,000 miles as well as greasing some 20 or so chassis fittings every 1,000 miles. But aren't we discussing a contemporary BMW and modern, synthetic oil?
Tom K.
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Yes. While the oil will hold it's viscosity much better than oils in that era and the filters are much improved, dirt will get into the oil via a number of different sources in addition to particles resulting from engine wear. I prefer to eliminate these suspended particles by changing the oil.
It's really quite a simple concept.
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