I had some guy tell me it was safe to use that b12 chemtool on rx7s( in the gas tank as well as the in the oil to clean the motor out too) i just wanted an expert opinion on it, it seemed kind of hard to beleave but he know his **** about cars. what do you guys think?

 

maybe safe but what about effective

 

Lots of people "seem" to know a lot about cars. Many of those people don't know **** ...... especially when it comes to rotary engines.

What do you hope to accomplish by doing this? Oil gets dirty, so you change it regularly. This should keep your oil clean enough. If you want to clean your injectors, BG44K is about the best you can get for an "in the tank" additive.

 

Keep in mind that any additive CAN reduce octane. Having said that, I use Chemtool religiously in all my engines. It is a wonderful anti-varnish solvent. It won't HURT anything, but....be your own judge.