I'm not sure about the Chevron oil, but I do know about the Valvoline. To
start off with, I am a Manager at a Valvoline Instant Oil Change. So this
can be seen as self serving, but, unless you don't do your own oil changes,
and you live in Southern New Hampshire, there really is nothing I'll be
gaining from this. Now to the oil, I would recomend going with the
Valvoline Max Life oil. I have 2 vehicles, both of which have over 150,000
miles. The first time I used it was in a '91 Audi 200QT. On my way home
after using it, I saw an increase in power, the engine ran cooler, and my
mileage went from 24 mpg to 25 mpg. For my truck ('90 K1500), I don't have
a comparison between the Max Life and another oil, I bought it around a
month and a half ago, and went straight to work and changed it along with
the diff, transfer case, and tranny fluid. Having talked to customers who
use it, most have told me that they also noticed a difference. Also, if you
have minor oil leaks, the Max Life will help recondition the seals and
gaskets and can stop the leaks.
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