The car will be getting a new alternator tomorrow.While they have it i may as well have them check a few systems.Can they read the codes some way without deciphering the check engine light blinks?I'll ask them to do that anyway .I guess i should ask them to change the O2 sensors as they're probably original and if not at least 20 k on them in they were replaced right before i got it and there were no receipts for them among what i got.How about other important sensors.I assume if they can read the codes those issues will appear, are there any items that aren't going to return a code if they are bad?I should get an oil change too.What grade Lubro Molly should i ask for in the M60 with cold New England Winter coming?