Automakers Lengthen Oil Change Intervals
in [Drive]
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From: John Henderson on 29 Mar 2007 15:21 Steve Barker wrote: > If you insist on using the $ynthetics then the change interval > is 3,000 miles. It doesn't matter if you pour in liquid gold, > it still gets dirty in the same length of time. Well, I change the ester-based synthetic at 10000 km (6000 miles) in all the family's vehicles. Synthetics don't shear to an appreciable extent. Nor do they oxidize anywhere near as quickly. They keep an engine visibly clean to very high mileages - you don't see any dark deposits forming on components when you look at the valve train through the oil filler hole. So the oil passages very clean - important for components with tiny oil passages like hydraulic lifters and timing chain tensioners. And ester-based synthetics have the added benefit of being polar. They cling to metals so as to minimise dry-start wear. If they weren't so good, esters wouldn't be the specified lubricants for jet engines. Our present cars are modern enough to have oil filters, which remove almost all of the potentially damaging abrasive particles. The soot and ultra-fine material which stays suspended has been _proven_ to not be a problem. So I'm being conservative in changing at that low mileage. But I suppose the above will go straight over your head if you're mind's already made up. Like you, I'm retired too. But I do make an attempt to keep up. John
From: John Henderson on 29 Mar 2007 15:28 Mike wrote: > All the engine oil coolers I have ever seen were air > cooled regardless of manufacturer. My 1996 VW Transporter comes standard with an oil cooler, which gives oil <==> coolant heat transfer. So my oil heats up quickly as well as never getting excessively hot. John
From: John Henderson on 29 Mar 2007 15:37 Mike wrote: > Got any proof to back up that claim ? I have to call > bullshit on that one, > it doesn't even make sense. "Testing with partially stressed oil, which contained some wear debris, produced less wear than testing with clean oil. This finding was unexpected and initially confusing (further inquiry suggested that the result was not so surprising, as many oil chemistries require time and temperature to enhance their effectiveness)." http://www.swri.org/3pubs/IRD1999/03912699.htm John
From: Big Shoe on 29 Mar 2007 15:55 On Fri, 30 Mar 2007 05:21:51 +1000, John Henderson <jhenRemoveThis(a)talk21.com> wrote: >Steve Barker wrote: > >> If you insist on using the $ynthetics then the change interval >> is 3,000 miles. It doesn't matter if you pour in liquid gold, >> it still gets dirty in the same length of time. > >Well, I change the ester-based synthetic at 10000 km (6000 >miles) in all the family's vehicles. > >Synthetics don't shear to an appreciable extent. Nor do they >oxidize anywhere near as quickly. They keep an engine visibly >clean to very high mileages - you don't see any dark deposits >forming on components when you look at the valve train through >the oil filler hole. So the oil passages very clean - >important for components with tiny oil passages like hydraulic >lifters and timing chain tensioners. > >And ester-based synthetics have the added benefit of being >polar. They cling to metals so as to minimise dry-start wear. >If they weren't so good, esters wouldn't be the specified >lubricants for jet engines. > >Our present cars are modern enough to have oil filters, which >remove almost all of the potentially damaging abrasive >particles. The soot and ultra-fine material which stays >suspended has been _proven_ to not be a problem. > >So I'm being conservative in changing at that low mileage. > >But I suppose the above will go straight over your head if >you're mind's already made up. Like you, I'm retired too. But >I do make an attempt to keep up. > >John All kind of claims are being made in this thread and it is simply not possible to prove any of them unless a lot of $$ and test facilities are available. All I can say is that I started changing oil and filter every 5,000 miles when my 1969 Galaxie 500 was new and I've been doing it ever since. In that time, I have put well over 100,000 miles on several vehicles and have never had to open an engine and have never had oil burning problems. One thing that seems obvious - people selling oil changes make more money if you change more often. Naturally they will recommend changing as often as they can get away with. I'm really dating myself now, but well remember when standard change was every 1,000 miles.
From: Steve Barker on 29 Mar 2007 16:13
to answer your question at the end, if nothing else, price. There are many other advantages though. -- Steve Barker YOU should be the one controlling YOUR car. Check out: www.lightsout.org "C. E. White" <cewhite3(a)removemindspring.com> wrote in message news:460bc8bd$1(a)kcnews01... So > where is the advantage of straight 30 weight oil? > > Ed > > |