[Tuscani GK]

I use AMSOIL and change it every 15,000 miles.

Going on 150,000 miles on the car and it still drives like a champ. ...which reminds me, it's about time to change the oil again. I also use AMSOIL oil filters.

The AMSOIL website is awesome. You put in your year/make/model/engine and it gives you a page with links to anything they make that's for your car (it even includes a link to the INJEN intake which is overpriced, but whatever). We're talking transmission fluid, brake fluid, power steering fluid, plugs and wires (NGK), wiper blades, it provides capacities, torque specs, etc. As I said, awesome.

That's my sales pitch. My sales contact is awesome, too. I get hand-written thank-you letters every time I place an order. That's personal service, IMO.