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My son's GrandAm uses platinum plugs. At almost exactly 100K miles, the published life expectancy for platinum plugs, his car started to suffer from mis-fire issues. It is no fun changing the back side plugs on a V6 engine in the middle of a Michigan winter in the driveway.
My wife's 9-3 2.0T uses platinum plugs. I replaced hers at 45K miles, Saab recommends 60K miles, and I was surprised at the amount of tip erosion.
Saab probably says 60K miles for the 2.3 Aero engine but I did mine at 40K based on what I saw with the plugs from the wife's car.
_______________________________________
Saabs owned:
2008 9-5 Aero Sedan, sold at 227K miles
2006 9-3SC 2.0T - Wife's daily driver
2000 Viggen Convertible - Sold May, 2022
1964 Quantum IV Formula Car - Retirement project
2000 9-5lpt Sedan, sold at 318K miles
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