Additives oil / petrol

[niceone]

I have had a oil service 1000 miles ago but was wondering if anybody uses additives for the oil or petroleum 

[T24RES]

I use decent oil and change at 4k, only use it as a second car. As for the fuel, I use shell with the additives already in. Save your money ?

[mattomg]

I think T24RES is right. I had a look around at additives for oil & fuel plus reviews by autotrader.  A cheap fuel plus an additive (even if they do what they say they do which is debatable) works out costing more than buying a premium fuel with a higher octane & cleaning components.

The only thing I would consider is an additive just before an oil change to make it more liquidy.less viscous so more congealed oil drains out - if this is possible...............but I would rather spend on a good quality oil in the first place.

[niceone]

shell

[T24RES]

Shell = https://www.shell.co.uk/motorist/shell-fuels/shell-v-power/shell-v-power-unleaded.html

[mikefocke]

Beware additives as they sometimes conflict with the additives already in the oil. The additives refiners use are not public knowledge so you can't even select a compatible additive even if you are chemically informed. One very knowledgeable shop is even suggesting you not even add oil from a different refiner. Only change oils at the complete change is the way I read his advice.