100k
Spark plugs are recommeded by GM at 100k (for a stock car). I waited until 100k to do them on one of mine and the original plugs came out looking great. There was little to no improvement (MPG, power, etc.) with new plugs at that mileage, so if you wanted to wait a bit longer I don't think it would hurt (assuming that all sensors are working well and A/F has been relatively good.)
I'd clean the MAF if you have never done so.
PS and brake fluid changes would be a great idea.
When was the last time you did a fuel filter? Or air filter?







