Hi there, would like some advice on what's best with regard to oil type for topping up on a 2012 RCZ 2 litre diesel engine. I've just bought 5 litres of 5 40 oil but having seen other posts 'Total 5 30' seems to be the more favourable oil. Is there any problem using what I've putchsed or would I need to change it for the Total product instead? Is there any real difference between the two as I know a bit regarding engines and the low number I believe is related to assist and give protection to the engine start up at low temperatures so I don't think it makes a massive difference in what I've bought but would welcome any advise. Thanks in advance.