My Personal Choices
Filters: I use OEM filters purchased in bulk from Sloan's in Tennesee, which is a dealership for the big Four Japanese manufacturers. I've been mail-ordering from Sloan's for many years, and I've always gotten good service. I have also bought filters from Perf-Form, and have been very pleased with their products and service.
For the Duke, I purchase K&N or HiFlo filters, because that bike is a little harder to buy for.
My cars get Purolator Pure One filters.
Motor Oil: Currently, I am using Shell Rotella T 15W40, purchased in 5 quart bottles from the local Wal-Mart. Why? The Total Base Number (a factor keeping oil from turning acidic over time) is higher than my previous favorite, Castrol GTX, and it's cheap. A higher TBN will allow you to go longer (time-wise) between changes without the oil turning acidic and attacking your bearings. With four bikes, any one of them is not likely to get 3000 miles in 6 months (the recommended time interval for most oils).
Once again, the Duke gets special treatment with Mobil 1 20W50 now that it is completely broken in. I've heard that Mobil doesn't sell this one anymore, so I might have to switch.
The cars get whatever 100% synthetic happens to be on sale in the proper weight. I've used Mobil 1, Pennzoil, and Castrol in 5W20 and 10W30.
Before you turn up your nose at cage juice in a motorcycle, realize that both of these oils placed well above Honda's non-synthetic motor oil that they specify for their machines. MCN's latest oil articles are excellent reads if you haven't seen them.
If you need further, but non-scientific evidence, talk to Mike Case. His '94 CBR900RR had more than 250,000 miles last I heard, and he's been running Castrol 10W40 off the shelf.