OP, if you’re so inclined, consider performing a Berryman B12 piston soak. Followed by at-least 4 OCI with Valvoline Restore and Protect.
If the cause of oil consumption is piston ring carbon, you should see an end to your oil consumption. If there are some other mechanical causes for the...
Have you considered Berryman “Chem Dip” and a brass brush?
https://www.berrymanproducts.com/products/cleaning-degreasing/berryman-professional-chem-dip-carburetor-parts-cleaner-not-voc-compliant-in-some-states/
FWIW, I use HPL Engine Cleaner 40 (or 30) with 5W-30 Valvoline Restore and Protect in three of my Audis and my 2018 Toyota Sienna AWD. I use a mix ratio of 5:1, R&P:EC.
No problems.
Do you deny such mandates impact the price of automobiles?
Another and larger contributor is loose fiscal policy, devaluing the dollar.
Using your example of a $15k 1986 Buick Regal T-Type purchased in July 1986; according to the CPI calculator would cost $44,493.15 today.
Add in the cost of...