Rattlehead

Bjorn, good points. I can say that this bulletin was originally written before GM's release of the fuel additive, and they still held the position that no additives were advised. The reason for the bulletin was that it was known that customers were using additives even though GM did not condone the use of them. It was decided that, If customers will use additives anyway, they should at least be educated on what types are good or bad. Eventually, there was enough outcry from the field that GM should make an approved additive available, so they released their own and updated the bulletin with the part number.

One thing to consider is that water separation is more critical on a modern common rail design because of the high injection pressures. At full "throttle", they are running upwards of 26,000 psi. I don't think our low tech beasts are as vulnerable, but I still wouldn't want to pass water through the system, if at all avoidable.

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1970 M45A2
1989 M932A2 and Hiab crane trailer for sale