wrong oil

Ive only just learnt that you need to use special oil for diesel after I've changed my engine oil. The one I've used isn't specified as as SAE and recommends not for heavy duty diesel Is this a problem? Should I change it? Nulon Apex+ Full Synthetic 5W-30 Long Life Engine Oil 5L - APX5W30D1-5

All-- I changed the oil in my Mahindra 5545 (9 quarts) and my Komatsu SK1020-5 Turbo (10 quarts) skid steer today. I decided to use 15W-40 in the tractor and 10W-30 in the skid steer, using the temperature range shown in their respective manuals. Except, I screwed up. I flipped them: The...