Parts for your 2008 Subaru Impreza-Wheel studs nuts

2008 Subaru Impreza wheel studs and nuts

Technical references including the 2008 Subaru Impreza Owner’s Manual (Tyre and Wheel section), Subaru’s factory Service Manual (Chassis/Wheel and Tyre), and STIS service procedures confirm that this model uses wheel studs and lug nuts (not wheel bolts). Most 2008 Impreza variants run a 5-stud hub with M12 x 1.25 threads, the PCD is typically 5x100 on non-STI models and 5x114.3 on STI models. In all cases, the wheel is secured by nuts threaded onto fixed studs in the hub.

On the 2008 Impreza, the purpose of the wheel studs and nuts is straightforward: the studs are pressed into the hub and act as sturdy anchors, while the nuts clamp the wheel against the hub face. This layout makes wheel changes quick, helps align the wheel during refitting, and delivers reliable clamping when torqued correctly. The design expects a clean, flat mating surface and a dry, undamaged thread to achieve consistent clamping force.

As part of normal servicing, it pays to give the studs and nuts a once-over. Factory guidance calls for tightening the wheel nuts in a criss-cross (star) pattern to around 120 N·m using a torque wrench, then re-checking after a short drive. Threads should be clean and dry—no oil or anti-seize on the threads or the nut’s taper seat, as lubrication can over-stretch studs and skew torque readings. If a nut binds, the thread likely needs attention or replacement.

Common signs it’s time to replace a stud or nut include damaged or “mushroomed” threads, a nut that won’t torque smoothly, visible stretching, or a stud that spins in the hub. Replacing a pressed-in stud generally involves pressing or pulling the old stud out and drawing a new one in squarely, careless methods can load the wheel bearing, so many owners leave this to a workshop. It’s smart to replace the matching nut at the same time and, if multiple studs show damage, to renew them as a set.

• Always torque cold wheels and re-torque after 50–100 km.
• Keep hub and wheel mating faces free of rust and paint build-up.
• Avoid impact guns for final tightening, use a torque wrench.

What is the correct wheel nut torque for a 2008 Subaru Impreza?

Technical literature for Subaru passenger models of this era specifies about 120 N·m. A star-pattern torque on clean, dry threads is essential, with a re-check after a short drive. Owners should confirm the exact figure in the vehicle’s owner’s manual for their trim.

What size and thread pitch are the wheel studs and nuts?

The 2008 Impreza uses five M12 x 1.25 studs with matching 60° tapered-seat nuts. Most non-STI models use a 5x100 PCD, STI models use 5x114.3. Both variants still use studs and nuts rather than bolts.

Can a single broken stud be replaced, or should they be done in sets?

A single broken or stripped stud can be replaced on its own, provided the others inspect fine. If there’s widespread corrosion or thread damage, it’s wise to replace multiple studs and their matching nuts to maintain even clamping and service reliability.