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From: SMS on 13 Dec 2009 21:57
dr_jeff wrote:

> How should a qualified mechanic know how often to change oil, other than
> following the recommended change intervals by the engineers who designed
> to the car? Mechanics are trained to fix things and do preventive
> maintenance. They don't have the training in organic chemistry,
> metallurgy or engineering to make better recommendations than the car
> makers.

Perhaps they could send an oil sample out for analysis, LOL.

What's funny is people that look at their oil and see that it's dark in
color and they think that the color is an accurate indicator of whether
the oil needs to be replaced. It isn't. A mechanic might ask the owner a
series of questions regarding how the vehicle is used, but generally
they don't have time for this kind of evaluation on a job that costs $20-30.
From: dr_jeff on 13 Dec 2009 22:06
jim wrote:
>
> dr_jeff wrote:
>> jim wrote:
>>> dr_jeff wrote:
>>>
>>>> What you're making is a straw man argument.
>>> No you are. The question wasn't how often does it need to be changed but
>>> has it in the past been changed often enough. That question is usually
>>> easy to answer.
>> No, the argument with the picture of the sludge-filled engine is part of
>> a straw-man argument.
>
> No the picture is extreme example of the point I was making. Anyhow, if
> the engine is clean the oil has been changed often enough and if it
> isn't then it hasn't.
>
>
>>>> You have yet to explain how
>>>> a mechanic is supposed to know how often to change oil.
>>> Yes. And I'm not going to.
>> Correct, because a mechanic is not supposed to know how to determine how
>> often to change the oil independently, but, rather, follow the
>> manufacturer's recommendations.
>
> Well maybe if he is brain dead.
>
> -jim

Please tell me how a mechanic is supposed to know the organic chemistry,
metallurgy and engineering in determining how often the oil needs to be
changed.

If very think, chunky oil is coming, obviously, the interval is too
long. However, please explain what kind of knowledge base a good
mechanic has that let's him/her determine the proper interval better
that is better than the one recommended by the car maker.

Jeff
From: dr_jeff on 13 Dec 2009 22:09
SMS wrote:
> dr_jeff wrote:
>
>> How should a qualified mechanic know how often to change oil, other
>> than following the recommended change intervals by the engineers who
>> designed to the car? Mechanics are trained to fix things and do
>> preventive maintenance. They don't have the training in organic
>> chemistry, metallurgy or engineering to make better recommendations
>> than the car makers.
>
> Perhaps they could send an oil sample out for analysis, LOL.

And the mechanic is able to interpret the results of the lab analysis
how? The mechanic is able to tell that the lab is a good lab how?

> What's funny is people that look at their oil and see that it's dark in
> color and they think that the color is an accurate indicator of whether
> the oil needs to be replaced. It isn't. A mechanic might ask the owner a
> series of questions regarding how the vehicle is used, but generally
> they don't have time for this kind of evaluation on a job that costs
> $20-30.

And even if they do, they don't really have the knowledge base to apply
the information they get from the owner. Plus, people's guestimates of
how they do something (like percent of the miles that are highway miles
vs. city miles) is likely to be quite inaccurate. They don't know how
other people (e.g., kids, spouses) use the vehicle or drive it, either.

Jeff
From: Licker on 13 Dec 2009 23:06
One of the largest oil change chains, Jiffy Lube, for instance, is owned by
Pennzoil-Quaker State, and as such
has an incentive to sell as much of the company�s traditional
petroleum-based oil as possible."

This information is only partially correct. Shell Oil owns Pennzoil-Quaker
State.




From: Licker on 13 Dec 2009 23:13
My oil chnage light in my 2009 Dodge Truck comes on around 2500 miles.


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