| Wow! I feel like a real slob cos I only change mine every 6000m, with the occasional 3000m intermediate. In fact I was thinking about changing it at the weekend (reckon I'm around the 3000m mark). But I do use the Motul 15/50 fully synth mentioned by other posters.
I suppose I do more miles than many of youse guys; if I changed the oil as frequently as some of you, I'd be doing it every month! Literally.
Someone said; oil's cheap. Well fully synth plus a filter is say 40 quid. Like I said, if I changed it every month, that's 500 notes a year. Hardly negligible.
For all that, my engine's in good nick, and I've only had to replace one rocker. | 
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