Tails

If you are using an anti-scuffing paste make sure that there is no "carbon content" as carbon can cause corrosion with aluminium.

Tails 1990 928S4 Auto.

blown 87

Yea, with the right tools it is almost never a problem.
BTW, all the pro tools for plugs are pretty much all 3/8ths drive.

While Snap-On makes many spark plug tools, got pretty much all of them, the one I use on the 4 valve 928's is a very deep spark plug socket, still need a short extension, but at least if the extension comes off you can get the socket out with a pair of needle nose if you have to.

dr bob

My favorite plug tool for the 928 is a no-longer-available H-F piece that has the plug socket captive on the end of a 3/8 square extension. Only one cylinder is a challenge with it, and only because the crossbar is directly over the plug well. The captive swivel connection means that the socket can't be left in the well. I bought the tool many years ago for a boat I had at the time, but it turned out to be the perfect fit for this engine. The socket itself is a slip-fit into the cam cover wells o no change of getting a plug in wrong. Easy place to use the torque wrench too, something the toolkit piece doesn't support.