Sea foam is a well recommended brand... Amazon has it.
I recently bought Bardahl Oil Additive here(Nagua) for the Isuzu & planta.
Sea Foam is about $10/bottle - 16oz.... plus shipping.
I'll put it with a mudanza order over the holidays
https://www.carbibles.com/best-oil-additives-reviewed/
So this Sea Foam is an additive for both oil and gas/diesel...
I put it in my gas last tank....
Guess What ??
I now need to change my gas filter....
So, I guess it works
Similarly, my man just changed the planta's oil...
and remarked how dirty it was...
I reminded him that we put in the additive to clean
his face lit up w/ recognition.
I guess this stuff works
I saw a demo at Pep Boys - it seriously thins the oil for better lubrication
As I expect any of them do.