25,000 miles so far on a Racor 1000 2 micron element in a custom heated housing.

I settle the oil for a week at 120 degrees and gravity filter from a floating pickup also thru another 2 micron Racor 1000 element before putting the oil into my car's WVO tank.

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Ron Schroeder
'85 300 Turbo Diesel 2 tank WVO
'83 300 Turbo Diesel 2 tank WVO
Some former WVO vehicles since ~1980:
'83 Mercedes 240D
'80 Audi 4000D
'83 ISUZU Pup
'70 SAAB 99 with Kubota diesel
'76 Honda Civic with Kubota diesel
'86 Golf
Several diesel generators
All with 2 tank WVO conversion
LI NY