From talking to various mfgrs of oil, test labs etc. soot isn't the only reason for black oil. Detergents also turn black. It takes analysis to know for sure what shape your oil is in. Looks may mean nothing! Oilguard claims to filter out submicron soot and my anals. proved it. Before bypass, I had . 07% soot. After bypass, I had 0% soot. I'm not an expert on these things so I'm just giving you what I saw. I'm using soot as a benchmark. I deal with many kinds of filtration at work and if a filter takes out soot, it seems like a hell of a filter to me! Soot is ten times finer than talc - just to put thing into perspective. I put mine on the front cross member. I used auto transmission cooler hose to flex to the engine and from there used 3/8 soft copper and a bender to make some neat fitting lines to get to the filter mount and oil fill spout. Oil comes from the 1/8" plug over the filter and I made a bulkhead fitting for the oil spout so I wouldn't have to mess with the cap. I thought about the turbo drain pipe but the spout trick was a lot easier and more accesible. I still don't know about filter change intervals. Probably 4k on the full flow for sure and undecided on the bypass. Maybe do oil samples every 4k and change filters after the results show good so I don't waste filters. At work, I sample the machines every 2k hours and if the report says 'good' I change the filters. If the oil is ready to change, I change oil and filters and haven't wasted a $75 filter before knowing about the oil. String wound filters are some of the best fluid filters there are until you get to the exotic 'ultra filtration' micro fiber medias, RO membanes etc. They've been around a long time in commercial and industrial applications. Look at all the filtering area in there! Maybe the bypass filter can go more than 4k because of that. The company that has Oilguard now says they originated this product. If you order one just play dumb and say you placed an order before the takeover and they will honor the sale price. I really did order mine last week and I called today to make sure they got it. The order got lost but I'm getting the sale price anyway! Craig
[This message has been edited by C Schomer (edited 03-29-2001). ]