my mbz is hard to start; mech says to use starter fuel un it sat 8 mos

thanks for your concern. I thought it might easy like cars in the 60's and 70's when trying cold cars in the Midwest!

You could blow your engine is the concern. Use a good carb cleaner of gasoline instead.

thanks again. do you mean something like STP? After filling tank half full, I added a additive but haven't been able to start since that day to run the car any distance for the additive to circulate. I will call AAA to start me again. As long the battery charger is used to boost a start, it finally will start.

Yes or chemtool anything that wi burn. Some cheap stuff will not burn.