For this reason is generally a really good idea to use the proper OEM specified multi-grade oil when using conventional motor oils in colder climates. If you use a synthetic motor oil then this is not a concern all at as almost all brands pump at -40F. There are a variety of designs for the by-pass valve. 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. 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.
Being placed at the top of the can causes the spring to push the filter snugly into the gasket at the base. I suspect this 2007 camry 3.5l oil filter allows manufactures not to keep tight tolerances in manufacturing of the filter assembly.
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. Changing your oil every 3000 miles is basically a complete waste of your money, and bad for the environment. Even the worst of oil filters will last for 3000 miles without any problems at all, and almost any motor oil will last for 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 reason for this is that small amounts of moisture in the air tend to soak slowly into your motor oil. The oil system is not truly closed, even though you have an oil cap. The water mixes with the oil and other matter in the frame motorcycle oil filter 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. Some people will disagree with the above, but the fact is that just about every brand name non-synthetic oil (or "dino") will last 3000 miles and have almost no significant wear to the oil or engine. It is not cost effective to use synthetic oil if you car sits for long intervals with low mileage. The chief advantages to using oil filter cleaner are typically considered to be better at extended drain intervals, have better thermal stability, better cold flow characteristics, superior additive packages, and a lower coefficient of friction (resulting in lower engine wear and better gas mileage). Engine Oil management engineer 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. The lab indicated that I could be using the oil for a longer interval. 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.
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.
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).
Being placed at the top of the can causes the spring to push the filter snugly into the gasket at the base. I suspect this 2007 camry 3.5l oil filter allows manufactures not to keep tight tolerances in manufacturing of the filter assembly.
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. Changing your oil every 3000 miles is basically a complete waste of your money, and bad for the environment. Even the worst of oil filters will last for 3000 miles without any problems at all, and almost any motor oil will last for 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 reason for this is that small amounts of moisture in the air tend to soak slowly into your motor oil. The oil system is not truly closed, even though you have an oil cap. The water mixes with the oil and other matter in the frame motorcycle oil filter 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. Some people will disagree with the above, but the fact is that just about every brand name non-synthetic oil (or "dino") will last 3000 miles and have almost no significant wear to the oil or engine. It is not cost effective to use synthetic oil if you car sits for long intervals with low mileage. The chief advantages to using oil filter cleaner are typically considered to be better at extended drain intervals, have better thermal stability, better cold flow characteristics, superior additive packages, and a lower coefficient of friction (resulting in lower engine wear and better gas mileage). Engine Oil management engineer 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. The lab indicated that I could be using the oil for a longer interval. 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.
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.
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).
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