Quote:

Is it possible to get enough zinc AND detergent with VR1?



Yes. VR1 has the Zinc package with a detergent. Their web page specifically calls it out as OK for street use.

They separate what they call "conventional oil" from VR1 in the silver bottle here. The VR1 is still a dino oil. Here's the link. Valvoline Racing Oil Page

Also here is the link for their Zinc FAQ page.
Valvoline Answers About Zinc

For a car with no converter, another good option if you can find it is a 15W-40 diesel oil that is rated CI. Stay away from the newer CJ diesel oils.