Hi all, just been to fill up the missus's 172(you know they can't fuel cars!!) and noticed inside the filler cap it staes use RON 98, which is super unleaded, well ive been putting normal unleaded in, will this cause a problem?
Hi Darth - As the 172 has a higher performance engine than the average car it will probably perform that bit better with the slightly higher octane petrol. Whilst using the 95 RON will probably do no harm using a fuel better matched to the engine may also improve its efficiency and therefore more MPG. Although slightly more expensive it may well be cheaper in the long run. I suggest you try a few fill-ups and see what happens.
yeah a few cars out there are mapped better for higher octane altho they can knock back the timing when using 95 octane
dramatic drop in power on turbo cars such as scoobys and evos when using 95 octane, my old m3 hated the lower octanes and ran really lumpy
luckily newer cars have dual map settings which can cope with a varied range
if u get a chance try it with tescos 99ron and you'll see a sharper throttle response :d
The F4R engines fitted to the Mk2 clio sport range will happily take 95 with no problems, you just wont get full beans when you boot it.
THe best stuff to run on is V-power from shell as its a 99Ron Fuel and has a very good addative package the helps clean and protect the engine.
Because of the learning ability of the clios ECU it can take up to 100 engine starts before it makes the best use of the fuel grade you put in.
Before the V-power came out it was Optimax and it took a few months before the car picked up the change in petrol grade. I used to only get 280-290 out of a tank of petrol, now with the V-power i get 320 miles... even with a lead foot.
If you buy one of the new MK3 clio sports such as the R27 or 197 then it MUST be run on 98 RON + other wise it causes problems with the cat and engine performance.
Renault issued a recall on the cars to replace the hand books and the stickers on the filler cap to state that 95 must not be used.