Quote:
Originally Posted by mortybryant
I checked both of my receipts from first and second service. The only thing different was that my first service used bottled oil, my last service used bulk oil. I've done some research, and I don't see where this would make that much difference. Thoughts???
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Oil level? Oil weight? An overfill can cause resistance inside the motor and a thicker oil will slow everything down decreasing fuel economy.
Problem is you can't really determine oil viscosity, tech could have grabbed the wrong gun and you wouldn't know. It shouldn't account for a ~20% drop in fuel economy, maybe 10% at the most.