Gas/Oil additive for 2022 Forester

[Dreadnaught]

I'm thinking about using Mystery Oil to add it to the engine oil after every oil change and after every gas fill up because I know it helps clean the engine and fuel system, I'm just wondering which I should use.

 

[LostinTexas]

Gasoline has plenty of detergent in it these days. Most fuel additives are just a feel good additive.
In cold weather, if you have poor quality gas with water content, let the vehicle sit for extended periods, then a fuel stabilizer may be in order. Premium will not improve anything in a low compression engine. Only threw that in because it will certainly come up. The good side is, it will give you a reason to put those cleaners down the tube.
MMO should be added to oil a heat cycle before draining.
I'm certain answers will be all over the radar on this.