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if you want to be absolutely sure that your oil is still good, you should do oil analysis, but that costs money.
personally, i run mobil 1 synthetic. on average, i do only about 7500-9000 miles per year. i change my oil every 6k miles, and the filter every 3k miles. i've been meaning to send in the oil for analysis to be safe, but i have heard from many other people that mobil 1 and amsoil are easily capable of doing over 10,000 miles and still not breaking down.
volvo and mann filters are the same. in other words, volvo buys their filters from mann, and then sticks the volvo label/print on it.
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Kenric Tam 1990 Volvo 740 base sedan (B230F) My Volvo 'Project'
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