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Thanks to all for the quick replies! I've had this car 4 years and I am the 4th owner. Prior owner rode it in parades but I use for cruising 9 Mos. It's due for an oil change so I will give one of those recommendations a try. This car gets better gas mileage than my '97 F-150. Here is a pic of a...

Hello, would there be some good current options for recommended oil for 1975 Eldorado 500 CID GM engine? Mileage is at 50K (original!). Owners manual just says "good quality SAE 30". I wondered with all the improvements in motor oils since 1975 if there would be a benefit to using a particular...