Lower grade fuel in the states normally have more ethanol which is just alcohol. Alcohol displace water so that may be the reason the dealer recommends a switch to a lower grade fuel.

There is a thread where water or ice in the MAF cause the misfire and bucking that some people are experience with their X.

The good thing about the 4.4 is that there is no timing belt that needs to be replaced. The bad thing about a 4.4 is that the guide rails for the timing chain will needs to be replaced when you start hearing a rattle in the engine.

Other thing that can go wrong with a 4.4 intake manifold seals will eventually needs to be replace. Valley pan gasket will eventually needs to be replace.

Bushings for the thrust arms or the arms itself will need to be replaced when you feel a vibration when you brake at speed above 55 mph.

But we all love our BMW, maybe not as much as the PORSCHE or LOTUS. LOL

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD