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I recently bought coach 165 and had the oil and coolant changed before I drove it from Las Vegas to my place 5 hours away. I gave the shop Delo 100 but they used 10w40. How urgent is it for me to change to the single weight?  I’d like to put another few trips on it before i  take it in to have the oil pan seal replaced and then put in the correct oil. I’d say probably 16 hours of driving. I have a mobile guy that can change the oil but cannot do the seal and don’t want to waste that expensive oil. The engine is in great shape with 70,000 miles. 
Thanks in advance,
Mark

What engine does your coach have?

This advice below is based on your coach having a Detroit 92 series engine, if its not a Detroit or not a 92 series then things change. 

Me personally, I would change the oil now. Your gambling with a couple hundred dollars of oil versus thousands of dollars in potential engine damage. Damage to a bearing or excessive bearing wear is why Detroit recommends the 40wt oil in most applications, 30wt in very cold climates. CF-2 rated oil is what you are looking for. Some say you can run 15-40 in them but I am not one of them nor will I ever be, Detroit says 40wt then use 40wt.