My 08 6.4l PSD is my first diesel and I just purchased a stock of both motorcraft cetane booster and anti-gel on-line for about half the cost of the same products from my Ford Dealership. My question is when it gets cold do I use both booster and anti-gel or just use anti-gel in cold months and boost in warm months?

 

I use the anti-gel in the winter and the boost in the warmer months.

 

Where online did you buy?

 

I ordered from K-Mans Parts. Motorcraft Cetane boost and anti-gel were both $5.79 each for both.