This is all from the "Oil Filter Study"Originally Posted by Downtown42
"The Wix filter is a very well made filter. My praise goes to Dana for putting some effort into it. Aside from being a stronger case, it also uses a much better filter element (about the same as the AC Delco). Like the AC Delco, it also has a minor internal sealing problem. In this case, the bypass valve has a metal-to-metal seal to the filter cartridge. It probably doesn’t really leak either, but if it did, dirty oil could get to the clean side of the filter. Otherwise it is a good filter. Given the choice between the Wix and the AC Delco at the same cost, I'd pick one while blind-folded. However, the Wix is about twice the price, so"...A/C costs $2.99...
1515 NAPA GOLD "This filter is a Wix filter with the two-piece filter cartridge. As with the Wix filter, the metal bypass valve seats on the metal cartridge end cap with no gasket of any kind. Some small amount of oil probably leaks through there. It also has the tougher paper filter media of the Wix".
"If money is no object, I would go with the Mobil 1. Although it has Champion internals, it has a really tough synthetic fiber filter element, which is the Champion’s only major downfall. The element is stronger and thicker than the Purolator, but they claim that it flows just as good as paper. As with the other low-end Wix filters, it has no internal sealing problems. The $10 price tag is a bit steep, but it is the best filter you can buy retail. Watch for “Mobil 1 Oil Change” sales, which includes 5 quarts of Mobil 1 synthetic oil and a Mobil 1 filter. Granted, there are probably better filters available through mail order, but I haven't tested those yet"...
Mobil-1 Oil FIlter Specs..
Average Retail Price
Cartridge Outside Diameter
Cartridge Inside Diameter
Cartridge End Cap Type
Stamped-steel, with bypass valve
Anti-Drainback Valve Type
Nitrile rubber diaphragm
Bypass Valve Type
Spring-loaded steel, nitrile seal
Synthetic media, glued seam...........Excellent media
Element Surface Area
351 square inches
Hydrostatic Burst Pressure
SAE J806 Filtration Efficiency
Single pass: 98%.........................AMAZING!
SAE J1858 Filtration Efficiency
(This means it both flows and fiters very well)
Don't forget the 15W-50 Mobil-1 and 25-50 hour drains depending on how hard you "hit it"...prolonged idle...etc . From the new data I am seeing with this drain interval STP additive is optional..it sure can't hurt as these aren't aluminum blocks.
It's just hopped up engines and engines over 700 HP or so that I still maintain Mobil-1 20W-50 V-Twin is worth a good hard look.
If you choose to NOT use synthetic oil... with the new reduced ZDDP level in auto oil... my only recommendation is going with Mercury Marine either conventional or their synthetic blend. Who knows if adding STP to conventional oil is enough for a 500 Hp engine?