[QUOTE]Originally posted by tkamiya
[B]My opinions are only based on what they advertise on TV...

The tv ad shows that MaxLife oil helps seal the valve stem by expanding the valve guide..

I don't think it expands the valve guide(s).
It is supposed to soften the valve seals, as they tend to get very hard with heat/age/mileage.
I call it " Chevy Disease ".

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2007 C 230 Sport.