----- Original Message -----
From: Steve R. <[EMAIL PROTECTED]>
>
> I have seen this article years ago and since then I always check to see
> the rubber valve on the filter. I don't remember if it stated it, but
> for an example: Look at a Fram filter and the Fram Tough Guard filter.
> The Tough Guard has a 'anti drain back valve", so when you shut the car
> back off, the oil that might be in the process of being clean does not
> drain back into the pan.....well that's what I like to think..but it
> allows the filter to retain oil when your vehicle is turned off so your
> engine benefits from a filter full of oil at startup.
The presence of the rubber valve doesn't necessarily mean it works! I still have seven
or eight Champion D102s from a batch with non-working valves. I've had individual
filters from other brands with similar properties,
Cheers,
Bill.
--
Rarebits4classics
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http://www.rarebits4classics.co.uk
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