Engine Oil

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al - 07 Jun 2004 05:35 GMT

Hi,

Is it normal for a new engine oil to become really black (and I mean
black!) after 4,000km? Oil filter was also replaced at the same time.

If not, what could be the likely cause?

Thanks.

Al

1995 Subaru LX

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y_p_w - 07 Jun 2004 06:05 GMT

> Hi,
>
> Is it normal for a new engine oil to become really black (and I mean
> black!) after 4,000km? Oil filter was also replaced at the same time.

Depends on how black. Color is often a poor means of determining
what shape the oil is in. If you're really concerned, get a sample
analyzed.

> If not, what could be the likely cause?

There is no single "likely cause". I could imagine the following:

* Additives break down.
* Dusty conditions.
* Worn rings.
* Fuel contamination.
* Air filter seal compromised or a leak somewhere letting in
unfiltered air.

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