a correction: a simplified definition of pH:  higher pH number is more
basic; pH is defined as the negativ logaritmic concentration of H+
ions (in aqueous solution):  pH of 0 (concentration of H+ is 1 molar)
is the most acidic one, a pH of 7 (concentration of H+ = OH- = 10E-7)
is neutral and the highest pH is 14 (concentration oh H+ is 10E-14)
which is most basic

On 12/3/06, Jack R <jack007@comcast.net> wrote:
> Joel,
>
> Thanks for your positing.
>
> Here is what I have discovered so far today in my research, and seems to be
> in line with what you posted.
>
> So, which is the best, or will they all do the trick, since the Phosphates
> and high-PH seem to be the most important factors for our motors.  Sierra is
> Phosphate free but the PH is higher at 10.5-10.8, which is more acidic - So
> I think I will dump the Sierra this summer.
>
> $25/Gallon - Pentosin (PH 7.5) anti-phosphate hi-performance antifreeze
> seems to do the trick, as the PH is lower than Sierra and is also Phosphate
> Free.  However it is very expensive, and I think it is still a good idea to
> flush and fill every so often (as it can show if you have fluid transfer, or
> other problems)
>
> $12/Gallon - PrestoneR (PH is 8.7-9.2) Extended Life 5/150
> Antifreeze/Coolant is recommended and formulated for use in all GM vehicles
> that require a GM DEX-COOLR approved formula coolant, as well as all other
> cars and light-duty trucks with aluminum radiators. This patented formula
> has a concentrated blend of premium, long-lasting inhibitors for extended
> performance, protecting against temperature extremes and the ravages of rust
> and corrosion for 5 years or 150,000 miles. PrestoneR Extended Life has been
> proven in the laboratory to be compatible with all new extended life
> formulas at concentrations typically used in all newer vehicles coming off
> the production line today. These automobile manufacturers include:
>
> Audi - General Motors - Suzuki
> BMW - Honda - Toyota
> Daewoo - Mercedes - Volvo
> DaimlerChrysler - Mitsubishi - VW - Ford
>
> Tip: If you decide to replace your existing antifreeze/coolant with
> PrestoneR Extended Life 5/150 Antifreeze/Coolant, make sure you completely
> drain and flush the cooling system first in order to gain the full benefits
> of the longer-lasting formula. Also, if you are currently using Prestone
> Extended Life 5/150 Antifreeze/Coolant in your car's cooling system, and you
> add a conventional antifreeze/coolant, you will lose the extended
> protection.
>
> &
>
> $11/Gallon - Valvoline [Antifreeze] Zerex GO5; Gallon (PH 7.5-8.0)
> Zerex G-05 is a low-silicate, low-pH, phosphate-free, pre-charged formula
> that is designed to protect automotive and diesel engines from rust and
> corrosion. Zerex G05 is approved by Ford and by Daimler-Chrysler for
> worldwide applications including all MTU and Mercedes engines.
>
> Approved by Ford and DaimlerChrysler for use in automotive and diesel
> engines.
> Utilizes hybrid organic acid technology to minimize inhibitor depletion
> Low-silicate, low-pH and phosphate-free formula
> Provides protection against liner pitting and corrosion
> Helps prevent rust and corrosion
> Helps prevent hot weather boil-overs and cold weather freeze-ups
> Protects all cooling system metals, including aluminum
>
> Due to the differences in cooling systems, Valvoline recommends that you
> refer to your vehicle owner's manual for instructions on changing your
> antifreeze.
>

--
Karl
'81 Westy "Jenny"
Wilmington, DE