OK, I was a Ford guy and everybody used Stanadyne or Power Service additives. Over here all you guys talk about Primrose and Fppf. What is the difference???? http://www.dieselplace.com/forum/smileys/Geek.gif

Do a search on both of those products, you will find a wealth of knowledge on both products, as well as info on how each works in your fuel system.

If you liked the way Stanadyne worked in your Ford, continue to use it in your GMC. Stanadyne and Racor additives were recommended by GM.


I am using the Stanadyne. Seems to work.

It looks like you get what you pay for... Not much in Power Service:


STANADYNE PERFORMANCE FORMULA:
Ingredient Name: 1-(2-HYDROXYETHYL)-2-(TALL OIL ALKYL)-2-IMIDAZOLINE; 1-(2-HYDROXYETHYL)-2-ALKYL (C-18)-2-IMIDAZOLINE
0.8-1.5%
Ingredient Name: 2-BUTOXYETHANOL (ETHYLENE GLYCOL MONOBUTYL ETHER), BUTYL CELLOSOLVE, BUTYL GLYCOL, GLYCOL ETHER EB
5-15 %

Ingredient Name: 2-ETHYLHEXYL NITRATE *94-4*
20-35%

Ingredient Name: ETHYL BENZENE *94-4*
0.75-3%

Ingredient Name: NAPHTHA (PETROLEUM) *94-4*
41-70%

Ingredient Name: NAPTHALENE; MOTH FLAKES; MOTH BALLS; NAPHTHALIN; CAMPHOR TAR; WHITE TAR
15-1.5%

Ingredient Name: XYLENE, DIMETHYLBENZENE, XYLOL
0.75-3%
===========================================
<H1 style="MARGIN: 0in 0in 0pt">POWER SERVICE DIESEL FUEL SUPPLEMENT</H1>
<H1 style="MARGIN: 0in 0in 0pt">Ingredient Name: HYDROCARBONS</H1>
45%

Ingredient Name: HYDROXY COMPOUNDS
55%

<DIV style="BORDER-RIGHT: medium none; PADDING