I've got Mobil 1 5W30 in the truck now -- I'll pay attention for a few
days and see if the noise is still there.
Jon
On Saturday, December 27, 2003, at 11:21 AM, Smith, Bill wrote:
> The 5.3 in trucks has an iron block---5.3 in Trailblazers, Envoys, and
> others is Alloy----the problem is mostly piston slap as I understand
> it---I have never heard of one failing,,,If you force GM to change it
> most likely will still be there and you will have agreed that nothing
> else will be done---I have heard of people being able to get and
> extended warranty out of it---my recomendation if it just drives you
> crazy----I have never heard of being able to stop it
> completely---Mobil 1 will help some I have been told.---wmts
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