Old man at the Benz dealership says he’s been driving the same car for a long time and usually only puts in 87 octane in sprinkled with 91 every few times. What problems could this cause? Do I have to put in 91?
Disclaimer: I’ve owned (paid off) the car for 6 years and do put in 91, but trying to cut costs.
My 2019 with GDI and turbo runs much better on 93 octane, even though the manual says that 87 can be used. On 87 engine lags and the transmission seems confused for what gear to be in, none of that happens with 93, ( 87 and 93 are the choices where I fuel up ).