minus-squareFrozenbarb@alien.topBtoMechanic Advice@gearhead.town•What issues can be caused by not putting 91 octane gas in a car that advises to do so?linkfedilinkEnglisharrow-up1·10 months agoMy 1998 Mercedes ML320 takes 91. The few times I tried 89, a check engine light comes on. I did not read the code but I’m sure it’s a knock sensor denotation code. It goes away after I refuel with 91. linkfedilink
My 1998 Mercedes ML320 takes 91. The few times I tried 89, a check engine light comes on. I did not read the code but I’m sure it’s a knock sensor denotation code. It goes away after I refuel with 91.