Bmw Engine And Engine Cooling Exhaust System Emission Control Gas Recirculation Valve (egr Valve)

1997 BMW 740 IL check coolant indicator came on and then checked and filled coolant. but then 4 days later filled up gas tank on business trip(used regular grade of gas at unknown gas station that was closest) in evening then come morning when I

my 2008 335xi bmw has 43 thousand miles. I was driveing it tonight and the engine light came on and it started running rough.When I acelerated it act as if it wanted to stall.

when cold, 1986 bmw 735i  hard to start...gas leaking onto left side(drivers) manifold or engine block.  sometimes intermittant.  

Have 2003 Z-4 M54 engine with 83,000 miles.  Driving along and smoke started to come out of the exhaust then alot of smoke and car quit running.  Repair shop says it blew a head gasket which damaged the engine.  No warning lights or services e