Look in your vehicle manual for correct spec also,
My advise is don't go into the motor factors and ask them as they will advise what ever they think, they often get it wrong which is no good to you when damage is done,
I had an argument with one of the lads behind the counter when he advised me wrong and when I corrected him he got rightly snotty, needless to say I didn't buy my stuff from there after that,
Phone your Renault dealer or motorhome dealer if you cannot find the manual,
FatController may be able to shed some light on it for you as I think his knaus is on Renault aswell