@wdkwang - So he told you that Walmart grade Mobil1 was better than Redline 5W30? Hmmm, time to find a new mechanic. Sure M1 is good enough in most cases, but it thins out a little too much at elevated temps for my liking.
As for the filters, the Pure1 filter is very well constructed, and is one of the best filters for the money. Cut one open and take a look! The K&N and the M1 Extended Performance filters are two other good options for street driven cars given their solid construction and heavy duty filtration layers, compare the weight of these to any other filter.
An easy way to increase your filtration surface area is to buy the GT-R spec filters, these filters are exactly the same but slightly longer.
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