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What do you guys think? I'm leaning toward running Delo 15w40. This is a 109,000 mile motor that I fear has skipped a few oil changes lately. I will run Auto RX regardless.

I have a 2000 DTS with the Northstar (80k), a 2005 CTS with the 3.6 (25k), a '76 Fleetwood with the 500 cid (32k) and a '79 Deville with the 425 cid (46k). I'd like to go with true (Class IV and up) synthetics for these cars, both for the cleaning properties and the lengthened OCIs. The CTS...