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Groar,
Are your findings with the car just started up or after its at operating temp? The lower weight oil should make a noticeable difference on start up because the it doesnt have to warm up as much to achieve its operating viscosity. I know an old van my parents used to have said in the manual to use different oil weights depending on winter or summer. At least thats the only reason that comes to mind, unless your air filter was really really really dirty.
basslover911,
Thats a bit of a loaded question. Its really the same kind of deal as whether to do aero or weight reduction mods.
If you do mostly in city driving, I would recommend changing the oil every 3-4k miles, if mostly highway you can get away with 5-7k. Highway miles are easiest on the engine since it keeps a fairly constant load and isnt being asked to work as hard.
Over the past few months my driving has been about 75% highway, I changed the oil at 5k and I could still see through it, it had barely begun to darken. Huge difference from the old oil changes with mostly city driving and a lead foot. When I would change the oil then after about 3k-3500 miles it would be DARK.
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