Can some of you please tell me,since there are so much out there in the market, what are indeed great products you guys use and it actually is proven to be good and makes a difference, stuf like :

What - Gas Treatment ?
What - Oil Treatment ?
What - Oil Filter ?
What - Air Filter ?
What and Which Coolant ?

Or anything else that comes to your mind.... or also maybe what not get and to avoid.

Thanks

 

Gas treatment,-none
Oil treatment,--none
Oil filter,I use Purolator Pure one
Air filter,I use a S&B high flow filter.
For coolant I use just enough Prestone to bring the distilled water up to the lowest cold temperature you're likely to see in your part of the world.For me it was 0*.Then I add Redline waterwetter and a bottle of anti-corrosion additive.

 

one product i can think of is seafoam.

 

For gas treatment I would recommend tossing in some injector cleaner about ever 6th-10th tank full
For oil treatment I have tried Duralube additive & felt it helped smooth out engine running
Oil Filter - go with Fram
Air Filter - K&N FTW
Coolant - not sure about a "better one" of those. Just remember to flush the system periodically