Has anyone else run into this?
I have 1991 Mighty Max and all the parts stores tell me I need a STP S3950 (example) oil filter but the one on my truck is a Pro-Tec 164 and it is way smaller.
When I cross reference the Pro-Tec 164 to STP I get S6607
https://www.oilfilter-crossreference...rt/PRO-TEC/164
I just thought it was weird.
If you buy NAPA parts they higher quality oil filters they sell are noticeably larger in diameter. I assume this is for more filtering materiel. The threaded hole in the middle is the same.
A tip - check the thread diameter of the recommended filter and then take a look at some of the other filters on the shelf (some have the diameter dimensions stamped into the mounting plate where the oil seal is located). 2 things can happen. You can find a bigger filter to replace the recommended unit (as 85ram has pointed out, more filtration surface + increased oil volume = good) and/or a substitute filter can work out cheaper. Be aware that cross reference part numbers don't always correspond and some don't even show up as a match. If you aren't sure (and it's practical to do so) take the old component in to be 95%ish sure.
I entered all the years for 2nd Generation Mighty Max into Autozone web site and searched for oil filters, and came up with the following:
YEAR THREAD SIZE STP FRAM 1986 Mighty Max 2WD 2.0L,2.6L 20 mm S3950 PH3950 1987 Mighty Max 2WD 2.0L,2.6L 20 mm S3950 PH3950 1988 Mighty Max 2WD 2.0L,2.6L 20 mm S3950 PH3950 1989 Mighty Max 2WD 2.0L,2.6L 20 mm S3950 PH3950 1990 Mighty Max 2WD 2.4L 20 mm S3950 PH3950 1991 Mighty Max 2WD 2.4L 20 mm S3950 PH3950 1992 Mighty Max 2WD 2.4L 20 mm S3950 PH3950 1993 Mighty Max 2WD 2.4L 22 mm S3950 PH7317 1994 Mighty Max 2WD 2.4L 22 mm S7317 PH7317 1995 Mighty Max 2WD 2.4L 22 mm S7317 PH7317 1996 Mighty Max 2WD 2.4L 22 mm S7317 PH7317
There seems to be some serious errors on Autozone's web site because my 1991 Mighty Max has the 22 mm filter threads. So Autozone is wrong or I don't have the right engine.
Correction: they are all 20 mm. I was looking on the 'notes' section of the STP filter where it said '22 mm.'Originally Posted by orwell63
https://www.autozone.com/external-en...4676_1019776_0
Be weary of the data on Autozones' site anyway. I used the torque specifications for the big end/rod caps for my Hyundai and they were waaay out. So much so that the bottom end locked up. Luckily I made the effort to cross check specs and manually try to rotate the bottom end by hand before doing catastrophic damage to my bearings...
Last I knew, NAPA Gold filters are just relabeled Wix, which are well-made filters. IMO Baldwin are even better but can be tricky to find locally (usually only at tractor/fleet distributors) unless you order online.
Anyway, the key specs are the threading, gasket diameter, and bypass valve PSI; as long as those are the same (or at least bypass PSI does not significantly exceed the spec), you can swap to any larger filter that will fit in the available space underhood. I'd go direct to the filter mfr's site for specs (Wix, Baldwin and Purolator are pretty good about this) rather than relying on any auto parts vendor, where any specs they post are secondhand and thus potentially erroneous.
Some filter mfrs. may consolidate their line esp. for filters only used on older vehicles, obsoleting several larger filter models and superseding their part nos. with a single, common, smaller one (which is thus guaranteed to fit within the same physical dims) that otherwise has the same key specs, and just keep that one in production. I highly doubt any mfr. would bother checking whether a larger filter model might also physically fit the space available for any specific vehicle application, but we can do that for ourselves. (That's how I found out my Lancia can use the Motorcraft FL1A size normally spec'd for the classic Ford Windsor & Cleveland V8s.)
1987 Dodge Ram 50 4G54 RWD longbed ("Elmo")
1979 Lancia Beta Zagato spider ("Lola")
1982 Lancia Beta Zagato spider ("Luigi")
^ Agreed.
With Respects Sir, Honored Posters-
copy and paste from ---OilFilterData.com ---
Brand▼ Model Thread ADBV BPV PSI Dia. in Ht. in Disp. in³ Wix 51381 M20x1.5 Yes 13-19 3.66 3.141 33.05 Wix 51334 M20x1.5 Yes 8-11 3.252 3.194 26.53 Wix 51626 M20x1.5 Yes 8-11 3.663 3.812 40.17 Wix 51334XP M20x1.5 Yes 8-11 3.252 3.194 26.53 Wix 51344 M20x1.5 Yes 8-11 3.242 4.069 33.59 Purolator Synthetic PSL14459 M20x1.5 Yes 12-15 3.15 2.95 22.99 Purolator PureOne PL10193 M20x1.5 Yes 8-16 3.69 3.09 33.04 Purolator PureOne PL14459 M20x1.5 Yes 12-15 3.15 2.95 22.99 Purolator PureOne PL14619 M20x1.5 Yes 8-16 3.7 3.75 40.32 Purolator PureOne PL24458 M20x1.5 Yes 12-15 3.15 3.94 30.70 Purolator L14459 M20x1.5 Yes 12-15 3.15 2.95 22.99 Purolator L14619 M20x1.5 Yes 8-16 3.69 3.75 40.10 Purolator L24458 M20x1.5 Yes 12-15 3.15 3.94 30.70 Fram PH3593A M20x1.5 Yes 12 3.02 3.39 24.28 Fram PH3985 M20x1.5 Yes 12 3.66 3.69 38.82 Fram PH3950 M20x1.5 Yes 12 3.66 3.09 32.51 Fram PH9688 M20x1.5 Yes 9-15 3.02 3.08 22.06 Fram PH6811 M20x1.5 Yes 12-16 3.17 3.3 26.04 Donaldson P550162 M20x1.5 Yes 11-17 3.18 3.39 26.92 Baldwin B421 M20x1.5 Yes 14 3 2.843 20.10
Great thread.
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