Can temperature, load and filter multipliers predict a universal oil-change interval?

No general multiplier set is used here. Oil life depends on the exact equipment, lubricant, duty, contamination, sampling, laboratory methods, trends and manufacturer limits.

Can oil analysis authorize continued use?

Only when the applicable OEM or controlled condition-monitoring program allows it and the authorized source evaluates representative test results against the correct limits and trends.

Does this worksheet interpret laboratory values?

No. It records an authorized continue/change disposition. It does not invent limits for viscosity, water, particles, acidity, additives or wear debris.

Are calendar and storage limits included?

No. Calendar time, storage, starts, contamination events and other independent limits must be checked separately.

Maintenance-source worksheet

Documented Oil-Service Limit

Compare hours since change with one authorized operating-hour limit. Enter oil-condition disposition only when it comes from the applicable OEM, oil supplier or controlled monitoring program.

No universal multipliersOEM/engineering source requiredCondition result not invented

Document comparison

Status

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Signed margin: limit − elapsed

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Hour-limit consumption

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No lubricant-condition thresholds, extension, sampling interval, cost or maintenance authorization is calculated.

Arithmetic only

hour margin = documented limit − hours since change

consumption = hours since change / documented limit × 100%

A negative margin means the entered hour limit has been exceeded. It does not predict remaining oil life.

Condition-based use requires authorization

Flender gearbox instructions 7300en (05/2024) allow oil-supplier examination and approval as an alternative to a fixed change interval, and require representative, repeatable sampling and retained results. That application-specific procedure is not a universal multiplier.

ASTM D6224-23 permits condition/test-result-based changes only within its specific scope: mineral oils and certain phosphate ester fluids in auxiliary power-plant equipment. It excludes general synthetic-lubricant coverage and turbine oils.

Removed model: temperature, contamination, load, base-oil group and filter multipliers had no verified universal source. Arrhenius approximations, beta ratings and synthetic-life claims cannot be multiplied into a defensible change date without equipment/fluid-specific validation.

Not assessed

Viscosity, water, particles, acidity/basicity, oxidation, additives, wear debris or laboratory alarm limits.
Calendar, storage, start/stop, contamination-event, warranty or legal limits.
Whether an “acceptable” result authorizes extension beyond a separate fixed maximum.
Oil cost, downtime, failure probability or fitness for continued service.

Bronnen

Flender 7300en, version 05/2024; ASTM D6224-23; ISO 18436-5:2012 (personnel qualification only, confirmed 2025). Exact closed acceptance limits remain NEEDS_LICENSED_SOURCE.