Most engine hardware including head studs, VANOS bolts, and exhaust studs can only be used once. While most of the accessory bolts and miscellaneous hardware can be re-used it is often handy to have a spare bolt or bracket just in case one breaks. Any aluminum bolt, such as those found in the N52 engine MUST be replaced no matter the age or visual condition.
The Black Market Parts (by Precision Raceworks) OE-Spec Charge Pipe O-Ring is made out of Viton and is capable of withstanding all fuels (including e85) as well as oils. These o-rings are made to OE specifications and are a direct replacement for the seal found in your factory or aftermarket charge pipe.
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