If you are due for new antifreeze, it wouldn't hurt to flush it out first.
The purpose of the pellets is to add a conditioner/stop leak into the system as a preventative measure. This is especially good for aluminum engines as aluminum can be a porous material and have very small pin holes left from molding processes that can cause problems. ( I was in diesel/gas engine manufacturing engineering for 37+ years. )
March, 10, 2008 AT 1:39 PM
Do not use them, they clogg stuff up more than doing anything, use liquid stuff, it really doesnt dissulve