Are any fuel additives (e.g. STP and the like) recommended to help keep a (standard) 1.6mpi in good health?

Or is it best to avoid all such products with this engine?

Or do they make diddly squat difference with this engine?

If it is a good idea then

a) How crucial is the mix, i.e. if "1 bottle for a 50-60litre tank" should 80% of a bottle be used?

Should the tank be "brimmed" or slightly less than?

stp is a waste of money. if your injector's are blocked then it's allready too late!

Rely on the quality of the fuel...it costs enough!

Additives are probably more likely to harm the CAT's health than do any good for the engine. Good servicing is far more important.

(In my opinion)

stp is a waste of money. if your injector's are blocked then it's allready too late!

STP was ok in my car, did the job, but there are more types of additives to use. Look around and see what there is.

Rely on the quality of the fuel...it costs enough!

Additives are probably more likely to harm the CAT's health than do any good for the engine. Good servicing is far more important.

(In my opinion)

The only point here I would bring up is the CAT issue, if you look at the bottles of different additives they will tell you if it is safe to use with cars that have CATS.

I would say do it, as I have never had a problem, actually my mpg was at 32 - 34 and was super sluggish after 1 bottle of STP i got less sluggish and my mpg went to 37 - 39. But in the end it is upto you, but this is my oppinion... i hope it has helped

Q