Synthetic oil for I-5s
Doug Johnson
ur-quattro at msn.com
Tue Aug 19 22:45:11 EDT 2003
Rob,
Huw's right on this. In your example, the duddya after the first weight,
your "10w," indicated that flows like 10 Weight oil under testing at the
(API???) specified "w"inter temperature. The "30" indicates that it flows
like a 30 Weight oil at (API's???) summer (warmer) temperatures.
A multi-visc oil indeed thins as it warms up, but not as much as a
single-weight oil does. That's to say that a 10W-30 get thinner as it warms
to summer test temperatures, but certainly doesn't get as thin as a 10 Weigh
oil would under summer conditions. Likewise, the 10W-30 will be thicker
under winter test conditions (10 Weight), but not as thick as 30 Weight oil
would be under winter test conditions.
HTH,
~ Doug
> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of Huw Powell
> Sent: Tuesday, August 19, 2003 11:34 AM
> To: Robert Deutsch
> Cc: quattro at audifans.com
> Subject: Re: Synthetic oil for I-5s
>
>
>
> > the better - 10 from 10w30 for example). Watch out for oils like 5w50
> > synthetic. When cool it acts like 50 weight oil, but when up to running
> > temps it acts like 5 weight (really thin).
>
> I think you may have that backwards... the whole point of the two
> numbers is that the oil (synth or fossil) works like the low number when
> cold (flows "better") and the high number when hot (stays "thicker").
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/
>
>
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