I changed my oil today and drove the truck about 30 miles, i got out of the truck before it shut down and noticed the exhaust smelled really wierd, like it was very sweet. I had changed my oil with rottela t heavy duty oil but it did not say on the front that it was diesel oil. On the back it said it was good for most heavy duty diesel engines including Cummins and CAT. When i took i oil filler cap off the engine it smelled like it was sweet, almost like biodiesel. Did i use the wrong oil and should i be worried???