The key is using the SAME BRAND of oil to assure compatibility.
This is common on truck fleets where the desire is to switch to synthetic (no problems with storage on vehicles used 1000, 1500, 2000 miles a week. 6 MPG ,
1500 miles a week , even a 2% fuel burn improvement is Money in a year!
They will add a gallon when oil is needed , and monitor if the synthetic gets past the gaskets and seals.
One gallon at a time , till the changeover also helps load the oil filter more slowly.
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