Car shaking issue

After my last oil change I put that tech fuel cleaner that lots of people recommend to clean out composites etc. Should I not do that anymore? On others cars people have said they notice a big difference.
 
Personally I would not recommend any of those. Don't really think they work..
However, there is a Nissan additive that you can get it from the dealer.
I guess those are safer. One of the mechanics at the dealer told me if I really want to use additive such as fuel injector cleaner, they have their own.
 
i can't validate the claim but i have been using this for a really long time... and i have never run in to a problem. for FX i buy the one that treats up to 20 gallons. and i use it once every 3000 miles. I didn't know nissan had their own additive!!!

You use the same thecron stuff too? I heard it's really good but wouldn't want to keep using it if there is possibly a side affect. I wonder how much the Nissan stuff is or what it's called
 
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