Eugene Auto Repair

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Fuel - Regular vs. Premium

Fuel - Regular vs. Premium

One of the questions I’m asked a lot is can you use regular in a vehicle that was designed for premium. The short answer is no. The engineers that design the engines and all the controls for it are very careful with the timing of what is called the power stroke. Years ago, when you could tune engines, one of the critical adjustments was ignition timing. Ignition timing as most other “tuning” adjustments are no longer adjustable. Yes, don’t ask for your car to be tuned anymore, it’s a word of the past with newer cars. To understand ignition timing, picture swinging a kid on a swing. The timing of pushing the kid is important, if you push too late, you are just pushing air (late timing or retarded timing) If you push the kid to early, you will slap his back or maybe push the kid out of the swing, not good. The perfect timing for the kid on the swing is to push him gentle in the beginning or the forward stroke and continue it until the kid is at th ... read more


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