Wow, you really have been saving up oil filter questions for 50 years, Randy. I'm glad you didn't wait another 10 years or I'd have to take over the Real Estate section to finish this answer.
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The reason there are so many different filters is because engines are all different. And space is at a premium. Most engine compartments I work on these days have no room to spare. So when designing an engine, all the immovable parts are designed first. Then later in the process, they find a place for the filter, preferably right on the engine block. In order to fit oil filters into the nooks and crannies manufacturers ultimately allot for them, filters have to come in all different shapes and sizes.
Generally speaking, more expensive filters are better than cheap ones, because they use better filtration materials. Instead of plain old Charmin, filters now use materials like synthetic glass microfibers, which do a better job of filtering the oil. That's also why smaller filters can be used. With better filtration materials, they can provide all the filtration the engine needs in a smaller volume.
We tend to stick with OEM filters -- the filters made by the car's manufacturer. You can never go wrong with those. Modern filters also have check valves, which explains why the oil doesn't drain out of your Subaru filter, even though it's mounted upside-down. Without a check valve, the oil would drain out, and that would be a problem. If the oil drained out, every time you started your car, your oil pump first would have to fill the oil filter, leaving other parts under lubricated for those first few crucial seconds that the engine is running. But the check valve keeps the filter full and completely solves that problem.
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So, basically, Randy, there's nothing to worry about. Stick with a Subaru filter or other quality brand, and you'll get all the filtration you need. I'll look forward to hearing from you in 50 years.
To remove an oil filter on heavy equipment, begin by making sure the engine is cool. Engine oil can be extremely hot, so dont attempt to remove the filter if the engine is still hot. Place a bucket or oil pan under the filter, then use a filter wrench to twist off the oil filter. Drain excess oil into the oil pan or bucket.
If the oil filter is stuck, you may need to take additional steps to remove it. First, attempt to remove the filter by using a filter wrench, which is the best way to grip a stubborn oil filter. If the oil filter cannot be removed using a filter wrench, then you can poke a screwdriver through the side of the oil filter and use it to twist off the filter.
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