[sideview_180sx]

im on my 3rd KA and my 2nd s13. all 3 engines got mobil 1 10w30. along with a standard tune up. and i've never had smoking. leaking. or a change in performance. these motors aren't built motors with tight tolerances. they are quite robust and can take a beating. don't baby it, beat it. and i also get amsoil at stupid cheap pricing. thanks to a sponsor. but i will be using that in a different motor. if you want clean oil. bite the the bit get a good oil filter. i have the trask setup and my friend is using the canton setup. super awesome filtration and i can run the oil in the car longer (currently 7K miles on the mobil 1 oil with the trask filter and the oil is still a nice brown). Good oil is only part of the equation, the filter is the main ingredient IMO. to having the best setup.