I always used Comma Xtec 5w 30 as recommended by CC. Good price on ebay. Imo more important to change regularly, than spend loads. 18 psi cold 75 Nm I always turn off master switch every time I get out of car, and have never had a battery problem, no matter how long I leave the car between outings. Allow the immobiliser to start flashing before isolating. The radius arm cap head bolt is 10mm so you need an 8mm hex wrench. Depending on whether you can slide the seat out the way, or in my case it was fixed quite far forward, and I needed to shorten the short leg on a long series wrench. I always spanner checked after events, but after a couple of times you will know where the problems are, which may vary on different cars. In my case, it was radius arm bolts, engine mounting bolts into block, top wishbone balljoint locknut and diff mounting bolts.