Call Suncoast or Sunset Porsche. Both great dealers should have the lowest price.

On Suncoast's web store...
http://www.e-partssales.com/miva/merchant.mvc?Screen=PROD&Store_Code=P&Product_Code =00004330105&Category_Code=986Cooling

Shipping kills the price savings there. The stealership is around $30 a gallon

Ah - forgot to follow up on this one.

The "gallon" for $12 that was listed on PartsTrain.com was actually 1.5 liters (about 1/3 gallon).

I brought this mistake to their attention and returned the Pentosin, but they didn't care or make any kind of apology or offer any way to make up for their error... great customer service there. When I asked to speak with a manager, they hung up on me. I called back again, and they hung up on me a second time.

They still haven't fixed the error on their website where it clearly states "1 Gallon, 1 Gallon Size Container".

Anyway, if you don't go the auto store route, just get the Porsche stuff. It's cheaper than Pentosin.

it seems like that's the route i will be taking. I just find it silly to pay for the name on the outside of the container when it can be had much cheaper.