Hello,

I just realized that I have been filling my volvo s40 with regular unleaded gas instead of premium for the last 2 months that I've had it. How much damage would the regular gas cause?

Thanks

 

you have a stock 2000 s40 1.9t? if so then gas grade is not going to make any differnece. your cars has been turned to run any grade of gas. you are wasting money on premuim. If you have it chipped then you have to run premium.

 

i find that i run better gas milage on premium gas..

are you sure regular gas is absolutely fine for the car?