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Hi, I have this nagging problem of difficult starting up. Normally it takes the 2nd turn of the key to get it started. Is it a common problem or is there anything in particular that I can look into. Any help would be great....
 

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Mine is a 500SL but, I did have a hard start problem. When I switched to Union 76 fuel, it went away. I had used Mobil for years, tried all the others. Shell was second best for starting. I have ordered Mix-I-go additive and plan on trying it. I had tried additives in the past, Marvel Miricle Additive and it worked with Mobil, too and my starting got much better.
 
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