Hi, I am just travelling around Australia in my My19 Santa Fe Active 2.2 Diesel and towing a 1600kg caravan. I have had a low oil pressure error twice on a 40 Deg Cent day after 200kms and the dealer checked the car over and found no issues. I believe that a 5w-40w oil would help but the dealer will not change it as it will affect the DPF. This oil is in the manual so why the DPF problem? Please advise. Also should I put in a larger transmission cooler but I do not seem to have a problem there.