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Ams-oil recomends a 25,000 mile change period on their engine oil. Has anyone done this? It seems pretty stupid to wait 25,000 miles, but would like to know if it works.What is the maximum you would wait to change it? Thanks

I'm in high school and can not afford to go to a tech. collage for a while after I graduate. I have lots of experience with cars, ranging from heating and A/C, to engines, to chassis, etc. Are there any tests or classes I can take to get an ASE certification without spending too much money in...