Long story short, I had a Ford 6.4 litre Diesel, rotten motor, nun the less, the motor blew under warranty.
Towed to the dealer.
Ford, not the dealer asked for proof of oil changes. I emailed right away all maintenance records including oil changes. Ford asked how I determined the appropriate time to change the engine oil.
My very short response was "when the "change oil light comes on" automatically I have the oil changes within a day or two.
Ford was very pleased with my response and replaced the motor and labour free under warranty (13k)
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