what oil filter should l use in my recently bought 98 mustang 3.8 L engine? and how much oil should l use?

Look in your owners manual. If you do not have one look in the filter book at the parts store.

Go with a Ford filter or any major manufacturer of a product. Fram is one that is okay. The owners manual will tell you how much oil to add. Dont overdo it.

fram high miliage with TRT

yes your manual should tell you and id go either with ford genuine filter or a k and N,WIX etc.
but K and N is by far the best l have ever used. it has a nice bolt on the end for easy take off and on.

Your Mustang 3.8 L engine holds 5 qts.
As for the filter, Motorcraft is of course, Ford is preferred filter however it is not mandatory to use. There are a number of many other brands of filters that will do just fine.
Fram, Motorcraft, Pennzoil, Delco, Napa, Carquest, Autozone, and many more. They're all perfectly acceptable.

Go to your local auto parts and any oil filter will be just fine. Do not buy into those crap about this brand is better than this talk because it is all a bunch of unproven facts.

You will never ever hear a story about a car broke down because he put a bad brand of oil filter such as Fram instead of a K&N.

So, go to autozone, pepboys, your local ford dealer (but more costly), or kragen and get the right oil filter for your car. It will be just fine.

Fram sucks they're the worst ones to get. There is a big difference trust me just cause u do not see it does not mean it is not there.

The type of filter media,amount used ,bypass valves r all different by manufacturer. l read a study in the past where engineers that have taken various filters apart tested media used ect.

After reading the article some of the best were purolater, mobile,wix, motorcraft tested pretty good. but was not the best. One thing it did say was that fram was one of the worst. If fram was so good do u think it would be at wal-mart it is there because it is cheap.

Stick with our motorcraft.