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On 4 May 2006 08:06:20 -0700, [email]jrunruh@gmail.com[/email] wrote:
[color=blue]
>whats the difference between the filter under my head and the one in my
>
>glove box.
>i just went to jiffy scam and they told me i needed BOTH repalced. i
>know how to replace the one under the hood myself, but then then showed
>
>me this other one that was more flat and they said it had to be
>accessed through the glove box? who knows. it was $30, and i replaced
>it.
>i have a 2005 toyoto matrix.
>
>was i scammed? there were leaves in it. how often does this need to be
>changed?[/color]

The air filter you mention sounds like the one that cleans the
passenger compartment. As for when it needs to be changed, I would
follow your manufacturer's recommendations. Typically in the past, I
would change any air filter I couldn't see light through. Sometimes
depending on where I drove, I would have air filters last longer than
other times.
[color=blue]
>
>what is the difference between that air filter and the one that is
>under the hood. thanks.
>
>also, totally unrelated.
>synthetic oil. what's the deal! my step dad said i could go 15,000
>miles in between changes. i have gone 7,500 and i changed it. the same
>dude at jiffy scam said that i was insane and no one can go that long
>in between oil changes. who is right? is it bad to go 15,000 in between
>
>changes, when using mobil 1 or whatever?[/color]


You can do what ever you want with oil. I've met people who drove
10,000 miles on conventional oil, but then it was because they didn't
car they trashed their car. If you have money, then violating your
car's warranty shouldn't be a problem, and if you don't follow your
car makers maintance schedule you could be violating it.

I was taught, oil viscosity break down was at a much higher mileage
than the typical oil change schedule, but that was only the laypersons
concern. Oil has adtivives that protect the engine, first being a
detergent, that keeps dirt suspension. This only last a few thousand
miles, so you could be cruding out you engine. Add in there are pH
buffers, and depending on you driving habits, you could be turning
your oil acidic and eating out any protective oxiode layers and
weating compenents even faster.

So long story short, follow your manufactures oil and air filter
schedule ( or let your step dad provide a warranty in writing for your
car. ;) j/k )

hth,

tom @ [url]www.NoCostAds.com[/url]