I had my 01 boxster its oil change 3,000 miles ago (during its 30,000 service) and I'm still waiting to add some 0W-40. Where is a good place to purchase Mobil1 0W-40? I tried PepBoys, Walmart and Target and though I haven't had to be too serious since the level is good I am thinking of being ready for when I have to add.
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