This is being cross posted to alt.autos.bmw and alt.auto.mercedes because they get more readership than alt,autos.jaguar and the issue is the same for some models of them.
I just picked up a 2003 X-Type with the 2.5 engine and only 3250 miles, yes that is correct, three thousand two hundred fifty on it. It is a long story not worth going into.
The owners manual says the car requires Premium Unleaded here in the USA. A person I work with has the same car and said he uses Regular NOT Premium and does not get any pinging and also gets the same mileage as when he used Premium. He claims that the computer retards the spark to prevent pinging and damage.
My question is will I damage the engine if I do the same.
Double Tap