Filters are not that complicated. The better they clean oil the more restrictive they are. The more restrictive the more the relief valve has to open. You can install a bigger filter, one with more pleats or two or more filters and that will help some. The best system is to install a Perma-Cool sandwich adapter put any kind of full flow filter on it you choose. Run a couple of oil lines to a Motor Guard M-30. Every 4,000 miles change the M-30 and add a qt of oil. Every one or two years change the full flow filter. On my Camry I tossed the full flow filter and run only the Motor Guard M-30. My 84 Subaru had 230,000 on it changing the Frantz oil cleaner about every 12,000 miles and adding one qt of Mobil 1 15-50. It worked OK for the Subaru but 12,000 mile filter changes are pushing it too far. 4 or 5,000 miles are a little better for the engine. I had to change the oil three or four times because of not changing the filter often enough.
The Subaru had a Frantz converter to eliminate the full flow filter. I have the M-30 ATF filter on the Camry and Legacy. The Motor Guard on the Legacy is over 30 years old. It's paid for.
I'm thinking about a single wt racing oil. They are low detergent. Poor filtration is what makes detergents necessary. I understand filters.Which oil to use can be confusing. From what I have been able to tell oil is similar to filters in that you have a trade off. Which is more important Fuel economy or engine durability? How can 10-30 protect an engine as well under extreme Texas temperature as a 20-50 racing oil? How about 50 wt racing oil? Red line has two wt racing oil.
Back in the 60's I put a Frantz oil cleaner on a Chevy Suburban with a 292 6 cylinder. The guy was Joe Davis of Davis Ingram Dacing in San Jose, Calif. He used Delo 100 20 wt in the engine. He didn't change the oil. The engine was still going strong at 350,000 miles I thought the 20 wt was too thin for pulling the dragster. He didn't. Valvoline furnished oil for the dragster. Baldwin furnish full flow filters. Chevy furnished the engines. When you are winning everything is free. A package comes in the mail. It's an engle cam. Joe helped me sell a lot of Motor Guard M-100's.
Engines ran dirty in those days. We changed the filter every 2,000 miles typically these days it is 2,000 for a V 8; 3,000 for a 6; and 4,000 for a 4. You can extend that and still keep within what is considered normal. If you don't change the submicronic bypass filter often enough it will get to the point where the oil will need to be drained. The Motor Guard is the easiest to service of the bypass filters with no spillage. For what an oil analysis cost I can just change the filter more often. The oil always looks like new in the gassers. 99% of the contaminants in motor oil won't even slow down for a full flow filter. To clean oil a filter must be effective to at least one tenth of one micron. That's about the size of cigarette smoke.
Ralph
