Generally, the valve uses a spring loaded design where oil pressure pushes the valve open as pressure builds up from a clogged filter. When a by-pass valve opens it circulates "dirty" oil directly back into the engine to ensure proper lubrication at all times. Usually, the valve is coated in some form of gasket material to prevent fram oil filter recomendations leakage. The can is the piece of metal that incases the entire assembly and is rolled into the base in order to create a liquid tight seal.
I suspect this chandelier allows manufactures not to keep tight tolerances in manufacturing of the filter assembly. As such, if the filter varies 1mm to 5mm in height then the spring would simply adjust and keep the purolator oil filters wholesale in place. What are the considerations when looking for an oversized filter? First, it's got to fit the physical space restrictions on the Prelude. This means that it's got to fit behind the engine, have enough clearance between the firewall and the engine, fit the oil filter mounting base plate, and have the same inlet threading (20mm x 1.5mm). Second, the by-pass valve needs to have the relatively same stiffness as the OEM by-pass specification. The reason for this is fairly simple: Too weak a spring will cause the filter to by-pass all the time, and to strong a spring may cause the filter to restrict oil flow and lower oil pressure. The OEM specification is 9-11PSI. Oversized motocraft oil filter cross reference offer you the chance to use extended drain intervals with your motor oil.
Changing your oil every 3000 miles is basically a complete waste of your money, and bad for the environment.
If you use Redline, Mobil 1, AMSOIL, Royal Purple, or Valvoline synthetic motor oils you can easily run your oil in your engine without any problems for the fram oil filter recomendations recommended change interval of 7500 miles. The only time you have to consider changing your motor oil at shorter intervals is if your car is not a daily driver, and will not warm up to full operating temperature for at least 30 minutes a day.
The water mixes with the oil and other matter in the peripheral controller system and forms acids that can eat your engine parts over time. Warming up the engine causes the moisture to leave the motor oil. If you are changing your oil every 3000 miles (because you drive the car once a week) or at a specific time intervals (every 4-6 months because you aren't putting 3000 miles on the oil), then it's not as import to use synthetic motor oil.
It is not cost effective to use synthetic oil if you car sits for long intervals with low mileage.
Engine Oil car oil filters Testing: There is only one way to actually prove how well your oil and oil filter are actually working: Send your oil out to a laboratory and have them tell you what is actually in the oil. Notice on the report that I used 10w40 AMSOIL synthetic oil and that the oil was perfectly fine at 6350 miles.
It turns out that this oil should be changed every 10000 to 11000 miles. I'm still using it, but just changing the oil every 7500 miles with either a Mobil 1, AMSOIL, or Fram x2 filter. It's simpler to change the oil and the headwaiter at once. The biggest advantage to having your oil tested periodically is that you can determine engine component failure prior to the engine actually breaking down. For example: If anti-freeze is found on your oil then you likely have gasket failure of some sort (head gasket). It's probably cheaper to fix the gasket then drive the car until the anti-freeze starts leaking seriously and causes the bearings to fail, etc. The Mobil 1 oil filter is well constructed and a decent filter. Unfortunately, I'm not been able to get my hands on a stock spec'ed Mobil 1 filter (but have taken apart a few oversized ones).