[s-cars] Subject: ticking- should i worry?

[LL - NY]

Didn't your oil analysis include particulate, metallic (alum & iron)  and
silicate counts with recommended allowable count ranges?

If so, if it's within range, I wouldn't worry too much about changing
sooner. And isn't the bypass valve in the filter, not the engine? If so,
it's renewed EVERY new filter.

Still, letting the filter fill wouldn't be good, so changing the filter
every 5K doesn't sound like a bad idea.

And the reason that older cars like the thicker oils is due to the main
bearing and camshaft journal designs, which were based upon manufacturing
tolerances capable of mass production at the time. Being that the design
requires certain viscosities to carry the bearing loads, I wouldn't go out
of the specified ranges in the manuals.

Today's stuff is of much tolerances, so they can use the lighter oils with
the benefit of less viscous drag. That being said, I do find that the UrS
seems perfectly happy with 10W-30, whereas my 10VT 200Q was not. Somehow, I
doubt that they changed the bearing tolerances between the cars that much
between the engines, although the 20V design was done after the original I-5
(actually the 2 liter I-4 of the C1) was done.

LL - NY



On 10/31/07, Theodore Chen <tedebearp at yahoo.com> wrote:
>
> how is it that the newer cars can go 15k-20k miles without an oil change
> or filter change, and still make it to 150k+ miles?  by now, there are a lot
> of them with 100k+ miles and no engine problems.
>
> maybe i'll let the oil go to 10k miles, and change the filter at 5k.
>
> ----- Original Message ----
> From: Taka Mizutani <t44tqtro at gmail.com>
> To: Tom Winter <tom at freeskier.com>
> Cc: cody at 5000tq.com; Theodore Chen <tedebearp at yahoo.com>; "
> s-car-list at audifans.com" <s-car-list at audifans.com>
> Sent: Wednesday, October 31, 2007 11:09:35 AM
> Subject: Re: [s-cars] Subject: ticking- should i worry?
>
>
> With oil analysis, you can determine how long you should be keeping the
> oil in your engine before changing it- however, you do need to change the
> filter regularly.
>
> Some synthetics can go 15k w/o breakdown, but you still need to change the
> filter every 5k miles.
>
>
> Taka
>
>
>
>
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