<VV> FW: How often do you change your oil?

[Ron]

With modern oil formulations, it's a definite waste of a finite resource to 
change oil every 3000 miles.  Once the oil is gone, it's gone!  The 
europeans have been running their oil for 10,000 miles for a long time now 
and they work their engines harder than we do with their style of driving. 
I think my Mercedes calls for a 7,000 mile change but I'll have to recheck 
the manual before I'll swear by it.
RonH

----- Original Message ----- 
From: "Joel McGregor" <joelsplace at earthling.net>
To: <virtualvairs at corvair.org>
Sent: Saturday, December 17, 2011 8:06 AM
Subject: Re: <VV> FW: How often do you change your oil?


> Like pretty much everything the government does all you get is a bunch of 
> hype and no facts.  Where are the oil studies that show that a 10k mile 
> change interval is acceptable?  Where are the studies that show pistons no 
> longer expand since they make them out of something other than cast iron? 
> I've read actual studies on oil in motorcycles that gave real data that 
> indicated 1500 miles was too long for several of the oils tested.  I've 
> never seen a cast iron piston myself and I've seen some pretty old 
> pistons.  My wife's CTS recommends not changing the transmission fluid at 
> all.  We bought the car with 6k on it and the trans fluid was like black 
> water.  I change my Mobil1 and transmission fluid at 3k and that doesn't 
> seem to be overkill based on how nasty and thin the oil appears when I 
> drain it.  I know that isn't very scientific but I haven't worn out any 
> engines lately.  I had a friend with a new Honda about 15 years ago that 
> had a 15k oil change interval.  I told her that
>  was nuts but she insisted that Honda knew more than me.  That engine was 
> smoking by 65k.  I guess the auto manufacturers won that battle over those 
> big oil nasties.  When's the last time you saw a study on resources wasted 
> on replacing cars instead of driving old ones?
> Joel McGregor
>
> Or, it's a conspiracy to rid the roads of cars which are gonna be
> wearing out faster.  ;)
>
>
> ...wtf?  When was the last time a car made in this country had iron
> pistons?   And iron expanding more than aluminum?
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