I finally cut open the STP SO3950 today. I was very disappointed, but not that surprised to find it with no more media than recent L 10193's
It is at the bottom of this chart. Not sure just when some of this data was collected, at least 10 year ago. It shows the media in lower priced filters have steadily declined. It is possible that it has been offset by improvements in quality, but I wouldn't count on it. Not sure oil filters make much difference. As near as I can tell, the only difference between an SO3950 and an L10193 is the company's home country. Unless River Rat posts test results showing otherwise, may as well buy American. Purolator best buy for the buck? Not for mine.
Brand-----P/N----Length width area Fits---endcaps---mfg--valves
Older data, 2000 ?
AC Delco--PF9-------102 2 1/2 255 77 LUV
STP-------S02856A---108 1 3/4 189 ''
Purolator L10193----105 1 3/4 184 ''
Power Flo SL14619----76 2 3/8 180 ''
Hastings--LF143------71 2 1/2 178 ''
ST--------ST3950-----98 1 3/4 171 ''
Fram------PH 3950----48-1 3/4--84 ''
2003 filters
Miata-----B6Y214302--69 1 3/4 121 1991 Roadster
AC Delco--PF2244G*---46 3-----138 02 Cavalier--------France
STP-------9018-------57 2 1/2 143 ''-----------------Korea
Purolator L15436-----52 2 1/2 130 ''-----------------Thailand
WIX 57082 Never got around to measuring it.
22 Aug 03 filters were a year or 2 old
ST--------ST3950-----84 1 3/4 147 77 LUV--------metal---------ADBV bypass
Purolator L10193**---76-----2 152 ''-------------card USA '' ''
Purolator L10193-----96-----2 192***''----------metal India '' far end
AC--------PF1177-----92 2 1/2 230 ''-------------card Canada ''
AC--------PF 47------56-----2 112 92 GrandAm----metal ''
AC--------PF 52------53 3 3/4 198 '' OS---------''----''
ST--------ST 3387A---46-----2--92 '' ''----------------USA ''
ST****----ST3950-----90---2.1 189 77 LUV--------Metal--------ADBV, bypass
ST 6-05---clicker '' 90 1 3/4 157 ''------------------------''---USA--ADBV, bypass '' ''
Purolator 9-08 L10193 64 1.75 112 ''--------''---USA--ADBV, bypass '' ''
2009 data
Purolator L10193-----75 1 3/4 131 ''-------------''---USA--ADBV, bypass '' ''
MicroGuardGL10193----64---1.6 102 77 LUV--------metal USA ADBV, dome
STP-------SO3950-----73 1 3/4 128--''-----------metal USA ADBV, dome
AC--------PF457------64---2.3 147 02 Cavalier plastic USA no valves (Hengst)
Dynalube--D5436------59--2.25 133 02 Cavalier plastic China
*The AC, Hastings, and Fram all said PURFLUX L264A on the end of the plastic housing.
**Interesting 1 piece of rubber for both valves
***The media was noticable thinner than the others
****9-04 newer black case
It is at the bottom of this chart. Not sure just when some of this data was collected, at least 10 year ago. It shows the media in lower priced filters have steadily declined. It is possible that it has been offset by improvements in quality, but I wouldn't count on it. Not sure oil filters make much difference. As near as I can tell, the only difference between an SO3950 and an L10193 is the company's home country. Unless River Rat posts test results showing otherwise, may as well buy American. Purolator best buy for the buck? Not for mine.
Brand-----P/N----Length width area Fits---endcaps---mfg--valves
Older data, 2000 ?
AC Delco--PF9-------102 2 1/2 255 77 LUV
STP-------S02856A---108 1 3/4 189 ''
Purolator L10193----105 1 3/4 184 ''
Power Flo SL14619----76 2 3/8 180 ''
Hastings--LF143------71 2 1/2 178 ''
ST--------ST3950-----98 1 3/4 171 ''
Fram------PH 3950----48-1 3/4--84 ''
2003 filters
Miata-----B6Y214302--69 1 3/4 121 1991 Roadster
AC Delco--PF2244G*---46 3-----138 02 Cavalier--------France
STP-------9018-------57 2 1/2 143 ''-----------------Korea
Purolator L15436-----52 2 1/2 130 ''-----------------Thailand
WIX 57082 Never got around to measuring it.
22 Aug 03 filters were a year or 2 old
ST--------ST3950-----84 1 3/4 147 77 LUV--------metal---------ADBV bypass
Purolator L10193**---76-----2 152 ''-------------card USA '' ''
Purolator L10193-----96-----2 192***''----------metal India '' far end
AC--------PF1177-----92 2 1/2 230 ''-------------card Canada ''
AC--------PF 47------56-----2 112 92 GrandAm----metal ''
AC--------PF 52------53 3 3/4 198 '' OS---------''----''
ST--------ST 3387A---46-----2--92 '' ''----------------USA ''
ST****----ST3950-----90---2.1 189 77 LUV--------Metal--------ADBV, bypass
ST 6-05---clicker '' 90 1 3/4 157 ''------------------------''---USA--ADBV, bypass '' ''
Purolator 9-08 L10193 64 1.75 112 ''--------''---USA--ADBV, bypass '' ''
2009 data
Purolator L10193-----75 1 3/4 131 ''-------------''---USA--ADBV, bypass '' ''
MicroGuardGL10193----64---1.6 102 77 LUV--------metal USA ADBV, dome
STP-------SO3950-----73 1 3/4 128--''-----------metal USA ADBV, dome
AC--------PF457------64---2.3 147 02 Cavalier plastic USA no valves (Hengst)
Dynalube--D5436------59--2.25 133 02 Cavalier plastic China
*The AC, Hastings, and Fram all said PURFLUX L264A on the end of the plastic housing.
**Interesting 1 piece of rubber for both valves
***The media was noticable thinner than the others
****9-04 newer black case