Got out the car yesterday after work and noticed oil coming up on to the bonnet from above the headlights, so popped the bonnet, only to find the gas strut not working, but more worrying was that the oil cap was sitting upside down on the manifold! Ive ve no idea how the cap has come off, I can only think vibration. I've not had the oil cap off in my ownership! No need. So any thoughts! will check the oil level and top it up... What oil is recommended? 5w40?? oh and if anyone has a gas structure for under the bonnet spare give me a shout! Cheers!