Manufacturer-stated lifespans assume their recommended maintenance cadence. Skipping PM cuts effective lifespan 30-50% on most refrigeration and fryer categories. The dollar impact is significant: a $12,000 fryer replaced at year 5 instead of year 10 adds $1,200/year to TCO.
Track actual lifespan on your own assets, not category averages. Your kitchen's environment (humidity, hours of use, water hardness) drives more variance than equipment brand does.