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You can use Bosch Platinum spark plugs because they will fit into the holes, but you will give up reliability and driveability. For some reason, the Bosch plugs do not play well with the Saab ignition/fuel systems. Stick with the factory recommendation for optimum economy and driveability.

Answerbecause of the Direct Ignition Unit. it sends MAX. 40,000 volts into the plugs to clean them at shutdown and its loaded with circuit boards. that's why it says only to use "resistor plugs", so engergy can not travel back threw the plugs and fry the unit. i would assume then that the bosch platinum are not of the resistor type. but i could be wrong, since switching to Saab i miss bosch products. I worked on SAAB"s for 18 years if you don't use the factory spark plug "NGK" you'll have problems-for some reason this car only likes factory orginal. and this goes for other auto makers. Never Never ever use "auto lite"because they auta light
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Q: Why can't you use Bosch Platinum-4 plugs on a 1997 Saab 900 Turbo?
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