What could do is make ur own penultimate 4cycle winter oil mixture for the next 59 years at the initial cost of $12 for a 16 ounce bottle of Redline ZDDP engine break-in oil additive.
Most modern automotive engine oils (last 5 years) averaged around 800ppm of Zn but today it is even lower due to REGULATIONS.
In 992 ml of synthetic 0W-30 API oil add
8 ml of Redline to achieve a Zn level of 1500+ ppm.
Don’t tell ur wife u what u are up to, since she will accuse u of wasting time. Lol
The ZDDP calculation