[Huskymaniac]

I get the K&N HP-4001 off K&N's ebay store. I would never use their air filters but these oil filters are basically the same material used in the Mobil 1 filters. Plus, they are the larger Porsche size like some of the others posted here. That means less flow resistance and more filter capacity.

For oil, I like high mileage oils for their cleaners and conditioners. The best non-synth is Quaker State. It has an incredible viscosity index which means it won't get too thin at operating temperature or too thick at ambient temperatures. Mobil 1 high mileage is better but I am still not comfortable with extended OCIs and it is too expensive to use every 3000-3750 miles. We discussed OCIs at Reading and one member does a filter change and top off when using synthetics. Now, if one is using a larger filter, like the K&N, maybe you can go 6000-7500 with synthetics and not even change the filter in the middle of the OCI.

On weight, this has also been discussed before and at Reading. The bearings apparently have too tight of a tolerance and there can be an issue with proper lubrication with thicker oils. Honestly, I can't decide if one would want the lower number or the higher number to be lower. It depends on whether the lubrication issue is more of an issue at ambient temperatures or at operating temperatures. If it is at ambient we definitely want a 5W versus a 10W. If it is at operating we definitely want a 30 versus a 40. One could just run 5W-30 but I would be concerned with the oil being too thin at operating temperatures in high heat conditions. Synthetics or a good HM oil with a high viscosity index may not have a problem with the oil becoming too thin. Personally, I think 5W-30 in winter and 10W-30 in summer is a good comprimise as the 10W-30 really shouldn't get too thick after sitting overnight in the summer. And a 10W-30 will be a little thicker at operating temperatures than a 5W-30. In all cases, a good HM oil or a synthetic is key due to the high viscosity index.