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Originally Posted by s2khah
The reason for the 3750 oil change is fairly clear on the HAH. I stated before it is due to the "Auto Engine Stop" feature.
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That is one reason why the interval is 7500, the engine doesn't run for all of those 3750 miles! (And moreso if you reboot alot.) I don't think that IMA actually uses the standard "crank and fire" type of methodology to start the engine, especially after reboot. Because the IMA is "cranking" the engine (at a far higher speed than a starter), the need to have an ultra high rich fuel mixture is alleviated.