Hi Rick130,
Happy thoughts.........this may not come as a great surprise but I use the RP oil filter as well not down to 1 micron however significantly better than the 27 to 30 micron you mention. Hence the reason I change it more often realising it is likely to get blocked / contaminated quicker.
As I said it was only 5 cents worth, what I do, I just offered an opinion which works for me which is what I thought all this was about. I didn't expect a mass migration over to Royal Purple.
Typically on turbo machinery we run a 10 micron filter only on gas seal systems do we go sub 5 micron, of course what you say is right however if filtered at 1 micron you would need a filter the size of a bath tub to get a realistic time period between changes.
Just another 5 cents worth............
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