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Originally Posted by Q45tech
A good rule of thumb is for every quart you increase the sump capacity you can add some percentage to 3,750/7500 miles..........how bmw/MB with 8 quarts and synthetics get 10,000 mile change intervals.
Lots of difference between 1 gallon and 10 gallons of oil........the filter won't help microscopic particles nor the depletion of additives nor fuel dilution [viscosity changes] past the rings.
Depends on how long you want the engine to last.
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How does oil age affect it's life? Do the BMW/MBs get 1 year change intervals or every 6 months?