can i run 5w30 synthetic royal purple oil with a fl-820s motorcraft oil filter or do i have to buy a royal purple synthetic oil filter? is it better that i run 5w20 oil?

 

That should be fine on a daily driver car, those viscosity rating aren't far enough apart to matter a whole lot. The filter isn't a huge deal either, as long as it's a decent one and sont some generic store brand POS.

 

I run M1 5w30 just because its cheaper. I hate paying more for a foo-foo 5w20 - filter doesn't matter either - I run K&N

 

I run 5w-20 RP with a K&N oil filter
The royal purple filter is fairly new so I haven't heard how it compares but the K&N oil filter is the best from what I've read

 

does anyone know the part # for the k&n oil filter?

 

The motorcraft is fine. I would use it over a k&n if it's cheaper.

 

i am soon to be supercharged. actually may 7th!! is it better if i go with the 5w30?

 

the part number for the K&N Gold oil frilter is HP2010
http://www.knfilters.com/search/prod...x?Prod=HP-2010
as for if you should go to 5w-30 I'd check with the super charger maker and see what they say

 

I've heard saleen and roush have recommended 5w30 in their supercharged cars for a while now.

 

The filter is ok the oil should be 5w20 Imo I would only use 5w30 if 5w20 wasn't available. I think Advance has 5Qt. of Mobil 1 5w20 and a mobil 1 oil filter as a special for $29.00 for April.