Prol'ly the very best coolant is the VW coolant. Somewhere, recently, I
read of a "G" series VW coolant that doesn't require periodic changing
out. That said, however, I  do now and have used for a number of years,
the GM orange biodegradable coolant that is for aluminum engines. In my
case it's a Texaco branded product. I change it out every two years
religiously. The system gets flushed, and refilled with fresh coolant
plus a bottle of Redline WaterWetter.

Regards,

John Rodgers
88 GL Driver
Jack R wrote:
> I'm sure this has been asked in the past, and I am sorry if it a repeat, but
> with all the new entrants and experiences I thought I would ask again.
>
>
>
> I just put a newer 2.1L 91 Wasserboxer motor in my 84 Westy, and put in
> Sierra Coolant.
>
> New larger coolant pipes, new radiator too!
>
>
>
> In the past I had always used Pentosin in my 1.9L 84 Wasserboxer.
>
>
>
> So the big questions is. which is better and why do you think so?
>
> Is there anything newer out there I should consider?
>
>
>
> I have been told that the choice of antifreeze can play a critical role in
> the head pitting.
>
>
>
> Any thoughts?
>
>
>
> Thanks for your input.
>
>
>
> Jack
>
> 84 Wolfy, N. of Detroit
>
>