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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 04-08-2013   #1 (permalink)
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Default A warning about stp oil filters

I bought an oil change deal at Autozone for Quaker State 10w30 oil and an STP oil filter for my 65 6 cylinder 200/auto. I had gone about 4000 miles on the old oil and needed to go to Houston which is about 80 miles away. After changing the oil /filter, I cranked it up and ran it for a few minutes and turned it off. I looked at the oil pressure when it was cold and I noticed it looked about 5 psi lower than normal. What was also weird was that it took awhile to build up to that pressure (about 45psi) whereas before it would climb right up and hit between 50 and 55 depending on outside temp. I didn't have time to do anything about it, but I kept it in the back of my mind as I was driving.
When it is warm the oil pressure will stick around 35 at 2500-2800 rpm or right at 70mph. On this trip it kept dropping down to 25 psi. my coolant temp hit 190 which is normal on a warm day (80+). When I would come to a stop the oil pressure dropped down to 5 psi with it in drive. I put it in neutral and it went up to 15, which on my car is low. I normally have about 20psi at idle with the car in drive at temp. First chance I had I pulled over to check fluids. All good, oil clean and at full, coolant was at the right level as was the tranny fluid. I limped home at 60 pressure at 25.
I noticed the stp filter was shorter than an equivalent motorcraft or fram so I decided to change the filter and leave the oil. Using an old racer's trick I used to buy the 2 quart filter for my 75 chevy pickup and it was good for 10 more psi over the stock filter so I figured using the longer motorcraft couldn't hurt. Sure enough just swapping the filter brought the oil pressure back up to 55 psi cold and gave me a running pressure of 35psi at 70. the pressure at a stop in drive at temp was 20, like it had always been. More importantly the pressure climbed back up like it used to instead of laboring up.

I knew I was going cheap but I didn't think it would restrict the flow like it did. I don't think my motor was damaged as I have driven a couple hundred miles since then. I got lucky. Long story short, If you are running an STP filter I would change it immediately.
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Unread 04-08-2013   #2 (permalink)
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Thanks for the info, glad your car's ok. I usually go with fram, haven't had any problems.
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Unread 04-09-2013   #3 (permalink)
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fram is worse .
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Unread 04-09-2013   #4 (permalink)
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I don't particularly like the base fram filter either and motorcraft does not filter as fine as I want, but this engine doesn't really need the super protection of a Mobil 1 or a Bosch filter. i change the oil usually around 4000 miles and it stays clean for a good portion of those miles so it seems that it is overkill. What bothered me was that while the STP kept the oil clean, it was restricting the oil to do it.

I have been using the fram toughguard on my other cars, I think I'll make them all TG equipped.

Incidentally I have a 318 dodge ramcharger and it calls for a Ph33/tg33 which is a short version of the PH8A/tg8a. I use the TG8A and it has also shown an increase in pressure over the short filter and the time it takes to get full pressure is reduced as well. The difference is not as great as it was for the STP.
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Unread 04-09-2013   #5 (permalink)
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I use the Autolite FL-1A...but read the other day that Fram & Autolte are both owned/made by Bendix. I never have liked Fram. Oh well, been using the FL-1A for years now so might as well keep on using it. Never has given me a problem.
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Unread 04-09-2013   #6 (permalink)
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I use k&n and rp oil


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Unread 04-11-2013   #7 (permalink)
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Tahnks, I needed a good laugh this morning.

Who doesnt know that different oil filters often result in different oil pressure readings?

Limped home at 60 with 25psi of oil pressure?

At highway speed, that car will run just fine at 10psi.
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Unread 04-11-2013   #8 (permalink)
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there is actually only a handfull of companies that make oil filters, honeywell make a huge number of the more common ones. I think wix is the only one that actually makes their own filter and sells it.
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Unread 04-12-2013   #9 (permalink)
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Quote:
Originally Posted by bmcgc View Post
Tahnks, I needed a good laugh this morning.

Who doesnt know that different oil filters often result in different oil pressure readings?

Limped home at 60 with 25psi of oil pressure?

At highway speed, that car will run just fine at 10psi.
Had you been in my position, you would have done the same and BS on the 10 psi crack. Yes it can run at 10 psi at 60 to get home, if you want to blow it up, but the engine won't last very long at that pressure.
At 25 psi at 60 it ran ok. Take it up to 70 it would drop to a little more than 20psi and the engine was reacting badly, noisier, rougher running.
I have been buying oil filters for over 30 years for all kinds of cars. I have never bought the cheapest filter by itself. I have on the other hand have bought an oil change special with the cheapest filter just this once. Normally they have the Toughguard fram available for a little more when they use fram filters on the oil/filter special so I spring for the TG. I understand there is a pressure drop in filters and some variation between brands and more importantly between the base and the top of the line of a particular brand. What I haven't seen is this amount of restriction, 10 psi through the teperature range.

I you ask anyone on this forum if their oil pressure was 10 psi at 60, then every one of them would tell you its time to rebuild. What a lame comment.
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Unread 04-12-2013   #10 (permalink)
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Quote:
Originally Posted by Pockets View Post
there is actually only a handfull of companies that make oil filters, honeywell make a huge number of the more common ones. I think wix is the only one that actually makes their own filter and sells it.
And Wix is made in the USA. North Carolina to be exact. O's sells them, and it's the brand that I use now whenever I can.

STP has always been crap IMHO.
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Unread 04-13-2013   #11 (permalink)
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Quote:
Originally Posted by daveboss200 View Post
...
my friend has an f150 with a 300 six and its got 20psi at highway speeds and about 5 at idle. he runs the balls off of it. its got 385k miles.

as long as the hydrodynamic wedge is maintained then the pressure doesnt matter.

you could have a brand new engine with really loose tolerances and a high flow oil pump and it may only have 25 pounds of oil pressure but that would be just fine...

pressure is only byproduct. flow rate is what really counts.
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Unread 04-14-2013   #12 (permalink)
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I've heard STP and most Frams (excluding toughguard) are about as crappy as wal mart brand. I don't know if this is true but I've also heard most Frams (again excluding Toughgaurd) are identical internally but I've never cut any up myself (Except a regular Fram I tore in half with a pair of channel locks)
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Unread 04-14-2013   #13 (permalink)
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Quote:
Originally Posted by 1972grande View Post
I've heard STP and most Frams (excluding toughguard) are about as crappy as wal mart brand. I don't know if this is true but I've also heard most Frams (again excluding Toughgaurd) are identical internally but I've never cut any up myself (Except a regular Fram I tore in half with a pair of channel locks)
Ive torn up a purolator and it was pretty basic amazed at how much junk it collected and still had good pressure. Way back when my oldest brother had a 66 falcon with a 170 and his motor had an aftermarket filter system that connected to the oil gauge port and had a replaceable filter (roll of toilet paper) it didn't affect his pressure as much as this stp filter did to mine. He also had one of those stupid ignition spark improver that supposedly connected the plug wires to each other to intensify the spark, so I thought he was batting 0 for 2 on his improvements.
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Unread 04-14-2013   #14 (permalink)
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I use Motorcraft.
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Unread 04-14-2013   #15 (permalink)
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Hello. I always use the FL-1A. They cost about a third of what the K&N oil filter costs, and, as far as I can tell, work just as well, and they don't have have any of the 'issues' the other similarly priced filters seem to have.
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