Oil changes and Oil sensors

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Tom Korth wrote:


Thanks again Tom, and sorry about that. I have no idea how that happened... I did watch "12 Monkeys" last night on TV. Maybe it was some of that bizarre time travel gone wrong again?
-Fred W
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Naw - it's the new series of Dr Who...
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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I'm with you Fred, there is no need to change the oil more often that the maintenance schedule calls for, with the POSSIBLE exception of the very first change where the goal is to remove any tailings that might be missed from the flushing during manufacturing. I wouldn't even worry about that because part of the expense I paid for the car in the first place is the process that is expected to remove these tailings. I have faith that the people building this stuff 1.) know what they are doing, 2.) take pride in doing what they do, 3.) have very rigid standards to build to, and 4.) the people selling the stuff that I pay extra for will fix it if the people in 1, 2, or 3 fail in their job for whatever reason.
So, the bottom line is, if anybody is more anal than I am, they might want to change the oil at the half-interval mark on the first oil change, but the oil and the metals are designed to specifications that allow the oil to be used at least as long as the oil change interval. Even if one thinks that 15,000 miles is too long, the engineers that come up with these numbers do it for a reason, and they have to bite the bullet if the numbers are wrong. In any case, changing oil ar 3,000 miles is way too often, especially in these days when the mantra of the environmentalists is that we are running out of oil.
London SW

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You will find a wide range of opinions. I believe you'll see in your maintenance manual that oil services are every 15,000 miles or one year, whichever comes first. Since BMW pays, I personally feel the 15,000 mile may be a stretch for financial reasons on BMW's part even using a good synthetic oil but that's my personal choice. And I love sensors except when they don't work. I do a change every 7,500 miles with BMW doing every other one free. On a new car, I'd pay the $100 now and have your oil and filter (especially) changed now but then that's a personal idiosyncrasy of mine regarding engine break-in.

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DaLoverhino wrote: <snip>

goes
Forget the stupid sensor, just reset it when needed. Do like me, use Mobil 1 synthetic, and change the oil and filter about every 8,500 miles, and forget about it.
-- Cliff
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Personally, the first oil change from a brand new car would be 3000 mile (5000km). Regardless what the dealer or trip computer might say. My theory behind this is, every engine, no matter how good the build quality, the internal mating surfaces will have some imperfections from brand new. Therefore the first few thousand miles will have them shaved off, smoothed down on their own. The filing will all gone back to the oil (hopefully). But doing that oil change, it get rids of those nasty filings.
Not sure if anyone agrees with me, but that's what I would do.
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When I acquired my new car in 2001 (German BMW competitor), the first new car in years, I found that there was no instruction to change oil after 'running in'.
This marque had previously recommended a change at 1500 km/900 miles, something also included in the service booklet.
This requirement had continued with this brand long after others had dropped it, so I was really surprised and a touch concerned. However, having spoken to an old-school service technician at the dealer's, I accepted it. Even he said that he had reluctantly come to accept the new ruling, that the engine does not need it.
Change oil if it makes you happy and saves you a psychiatric bill. Otherwise it's a waste of money and time.
DAS
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I'd say that modern machineing is such that there is little or no bedding in needed, therefore no 'swarf' etc generated.

Yup. It certainly does no harm.
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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