I dug out the owner's manual for my 1970 Dodge Charger. Here's page 48:
In case you can't read that, I'll spell it out for you:
Change the oil every 4,000 miles.
Change the filter every 8,000 miles.
And this was 33 years ago!
I think the quick-lube people have one of the most successful propaganda campaigns ever.
Cheers, 3MP

In case you can't read that, I'll spell it out for you:
Change the oil every 4,000 miles.
Change the filter every 8,000 miles.
And this was 33 years ago!
I think the quick-lube people have one of the most successful propaganda campaigns ever.
Cheers, 3MP