Compare example quantities
Using those chart columns, 20 US gallons corresponds to 2 or 4 fl oz; 40 gallons corresponds to 4 or 8 fl oz. These calculations follow the published levels and are not a reason to invent a higher one.
Keep the chart name on the note
Write Cetane Boost, the selected level and the package directions beside the calculation. If another additive is also used, give it a separate line. Do not transfer a cleaning or winter-product ratio to this bottle.
Handle unusual fills carefully
For partial fills, clarify the fuel quantity and any prior treatment. If using liters, use the appropriate manufacturer instructions rather than inserting liters into a gallons formula. Ask for help if the history or calculation is uncertain.
Check the official directions
Use the current package label and manufacturer documents for treatment rates, handling and application details.
Independent dealer link. Current price and availability are shown by AMSOIL.
Practical checklist
- Choose the intended official chart column.
- Determine fuel volume in US gallons.
- Measure and record the product amount.
Questions before you buy
How much for the example 30-gallon treatment?
The chart's two levels give 3 or 6 fl oz. Select the intended level and check the current instructions.
Should more always be considered better?
No. Stay with the manufacturer's directions instead of extrapolating beyond them.
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Prepared by SyntheticOilHQ, independent AMSOIL dealer 313120. Product information checked October 16, 2026. Consult the current manufacturer label for application details.