[madmaxx]

I plan on testing the 1A on Friday. If it has the same pressure drop as the 1HP then we know the micron rating is close enough. I still have my gauges hooked up so all i need to is swap filters.

As far as the Mobil, I dont know why I never have looked at them. Royal Purple has caught my attention. I guess for $15.00 I can find out for sure if the royal purple has a big pressure drop.

anybody know how much a divorce cost, LOL!!!! See the problem is my wife or one of the kids has to hold the pressure gauges so I can see them as I rev the engine to get pressure readings at 1k, 2K, 3K rpm's.

I bet in the end, I find no filter with a greater than 8 psig pressure drop cold or hot.