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oil capacity and lifespan



 
 
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  #1  
Old August 3rd 06, 04:14 PM posted to rec.autos.tech
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Default oil capacity and lifespan

Most 4-cylinder engines (anything up to say 2.5L) have around 4 litres
oil capacity.
A Jeep V8 5.2L engine has 4.7 litres oil capacity.
Does it mean the oil has a tougher life in the V8 compared to the 4-cyl
given the same driving condition? And so that means more frequent oil
changes for the V8?


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  #2  
Old August 3rd 06, 04:53 PM posted to rec.autos.tech
Scott Dorsey
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Default oil capacity and lifespan

> wrote:
>Most 4-cylinder engines (anything up to say 2.5L) have around 4 litres
>oil capacity.
>A Jeep V8 5.2L engine has 4.7 litres oil capacity.
>Does it mean the oil has a tougher life in the V8 compared to the 4-cyl
>given the same driving condition? And so that means more frequent oil
>changes for the V8?


No, it just means there are more places on the Jeep that need oiling, so
there's more oil needed in there.

I see no reason to change oil more often than every 3,000 miles on any
vehicle, unless under the most rugged of conditions. But you should change
your oil _before_ it starts to break down.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."
  #3  
Old August 3rd 06, 05:23 PM posted to rec.autos.tech
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Default oil capacity and lifespan


"Scott Dorsey" > wrote in message
...
> > wrote:
> >Most 4-cylinder engines (anything up to say 2.5L) have around 4 litres
> >oil capacity.
> >A Jeep V8 5.2L engine has 4.7 litres oil capacity.
> >Does it mean the oil has a tougher life in the V8 compared to the 4-cyl
> >given the same driving condition? And so that means more frequent oil
> >changes for the V8?

>
> No, it just means there are more places on the Jeep that need oiling, so
> there's more oil needed in there.


I suspect that it is related to the functional area of the frictional
surfaces, as
you have suggested. Having enough oil to moderate temperature variations
that you would normally encounter might be another issue.

It is an interesting question. I dont think that one would have to talk to
a synthetic oil technician. Whether dino or synth, leading lubricants
companies probably have all the answers to the questions we have been
mulling over. Getting a straight and unequivocal answer may be another
thing.

You may remember that when GM came out with the 4 cylinder Fiero, they had
a small oil sump, 3.5-4 quarts or suchlike. Very quickly they recalled
these cars and
refitted with a 5 quart sump.


  #4  
Old August 3rd 06, 06:31 PM posted to rec.autos.tech
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Posts: 2
Default oil capacity and lifespan

> I suspect that it is related to the functional area of the frictional
> surfaces, as
> you have suggested. Having enough oil to moderate temperature variations
> that you would normally encounter might be another issue.
>
> It is an interesting question. I dont think that one would have to talk to
> a synthetic oil technician. Whether dino or synth, leading lubricants
> companies probably have all the answers to the questions we have been
> mulling over. Getting a straight and unequivocal answer may be another
> thing.
>
> You may remember that when GM came out with the 4 cylinder Fiero, they had
> a small oil sump, 3.5-4 quarts or suchlike. Very quickly they recalled
> these cars and
> refitted with a 5 quart sump.


2 banks of 4-cyl almost certainly have much more if not double the
total friction area compared to a single bank.
Using less than a litre of additonal oil to cover that extra area looks
like the oil needs to work harder, meaning their additives would be
depleted faster (?)


B.
 




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