I was told that STP oil filters were pretty good since they are made by the same company was Bosch and Mobil 1. I went to autozone and the STP (size 2808) and Bosch did not have any bypass valve inside them. Is this something to be concerned about? I've heard Supertech may be a good alternative too since they are also made by Champion Labs. Is the valve inside the filter a big deal?
STP oil filters
- Thread starter HondaRD
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Patman
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Bypass valve or antidrainback valve? Some filters don't need a bypass valve, such as the ones for my LT1 Firebird, since the bypass is actually built into the engine block.
I'm pretty sure the the 2808 has a bypass valve. Some filters have it in the can end (not as obvious), some have it in the thread end and it will be much more visible. Most also have an anti-drain back valve.
I use the PermaCool sandwich adapter to install the Motor Guard M-30 bypass lube oil filter. I run into the same thing. The adapters for many GM cars and trucks don't have built in bypass valves. With these adapters the only oil the full flow filter can get is what comes from the M-30. The bypass valve in the GM block stays open. With these adapters you have converted your engine to a bypass system the same as a 53 Chevy.
The Ford 3/4-16 thread adapter 181 and the universal model 189 have the built in bypass valve. The resistance of the oil going through the M-30 makes the fail safe bypass valve open and allow oil to reach the full flow filter. All oil is going through the full flow filter but some is diverted to the M-20 and being leaned down to 0.01 micron. When some people use the PermaCool universal adapter on a GM car they will use a teflon plug that PermaCool sells to plug the stock bypass valve such as Ford, Chrysler, Toyota, Nissan, VW and a few others use. I had to make an adapter plate to make a universal adapter with a 2 3/4 OD gasket fit my Camry 2 1/2 OD block. Some Toyotas are the same as a Ford. On the GM cars some people plug the bypass valve and watch the oil pressure gauge. I get my adapters from www.jegs.com.
If you use a good motor oil and keep it clean you won't have to drain it. I change the M-30 every 4.000 miles on my Camry and Legacy 4 cylinder cars. Ordinarily it would be every 3,000 miles for a 6 and 2,000 for an 8. You need same new oil to keep the additive package up. If you go farther between filter changes you may get a higher wear rate but the engine may still last longer than what you need it to. My old 84 Subaru was still running good at 240,000 miles when I sold it.
I used synthetic oil and changed the filter about once a year or about 12,000 miles. I had to drain the oil a couple of times because of going too far between filter changes. About the only reasons I know of for needing an oil change is poor filtration or coolant and fuel contamination.
I cut open a Supertech filter, it looked OK to me. It's a typical high volume well made filter.
As long as you understand filters are a trade off. If they filter fast they don't clean oil. If they clean oil they don't filter fast.
The following is an interesting abstract:
Title: Don't Bypass Bypass Filters
Author: Gelinas, Tom
Journal: Fleet Equipment Vol: 14Iss: 7 Date: Jul 1988 pp. 39-41
Abstract:
According to some estimates, 60% of the potential causes of engine wear and failure can be eliminated by a well-designed and properly applied filtration system. Cummins Engine Co. recommends that both a bypass filter and a full-flow filter be used. A bypass filter shunts 10% of the total oil pump output through a filter and then back to the sump, bypassing the engine. Because this filter has high-pressure differential and low flow rate, it can filter out fine particles in the 5-micron range. In contrast, a full-flow filter has a low-pressure differential and filters out only large particles in the 40 micron to 60 micron range. However, the full-flow filter is located so that all of the oil must flow through it before reaching the bearings. The combination of these 2 filter types gives double protection against wear. Studies at the Cummins Technical Center indicate that wear can be reduced up to 91% by using a bypass filter in combination with a full-flow filter.
Ralph
The Ford 3/4-16 thread adapter 181 and the universal model 189 have the built in bypass valve. The resistance of the oil going through the M-30 makes the fail safe bypass valve open and allow oil to reach the full flow filter. All oil is going through the full flow filter but some is diverted to the M-20 and being leaned down to 0.01 micron. When some people use the PermaCool universal adapter on a GM car they will use a teflon plug that PermaCool sells to plug the stock bypass valve such as Ford, Chrysler, Toyota, Nissan, VW and a few others use. I had to make an adapter plate to make a universal adapter with a 2 3/4 OD gasket fit my Camry 2 1/2 OD block. Some Toyotas are the same as a Ford. On the GM cars some people plug the bypass valve and watch the oil pressure gauge. I get my adapters from www.jegs.com.
If you use a good motor oil and keep it clean you won't have to drain it. I change the M-30 every 4.000 miles on my Camry and Legacy 4 cylinder cars. Ordinarily it would be every 3,000 miles for a 6 and 2,000 for an 8. You need same new oil to keep the additive package up. If you go farther between filter changes you may get a higher wear rate but the engine may still last longer than what you need it to. My old 84 Subaru was still running good at 240,000 miles when I sold it.
I used synthetic oil and changed the filter about once a year or about 12,000 miles. I had to drain the oil a couple of times because of going too far between filter changes. About the only reasons I know of for needing an oil change is poor filtration or coolant and fuel contamination.
I cut open a Supertech filter, it looked OK to me. It's a typical high volume well made filter.
As long as you understand filters are a trade off. If they filter fast they don't clean oil. If they clean oil they don't filter fast.
The following is an interesting abstract:
Title: Don't Bypass Bypass Filters
Author: Gelinas, Tom
Journal: Fleet Equipment Vol: 14Iss: 7 Date: Jul 1988 pp. 39-41
Abstract:
According to some estimates, 60% of the potential causes of engine wear and failure can be eliminated by a well-designed and properly applied filtration system. Cummins Engine Co. recommends that both a bypass filter and a full-flow filter be used. A bypass filter shunts 10% of the total oil pump output through a filter and then back to the sump, bypassing the engine. Because this filter has high-pressure differential and low flow rate, it can filter out fine particles in the 5-micron range. In contrast, a full-flow filter has a low-pressure differential and filters out only large particles in the 40 micron to 60 micron range. However, the full-flow filter is located so that all of the oil must flow through it before reaching the bearings. The combination of these 2 filter types gives double protection against wear. Studies at the Cummins Technical Center indicate that wear can be reduced up to 91% by using a bypass filter in combination with a full-flow filter.
Ralph
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