Well, I changed out the oil. I suspect that the oil the shop put in was either not the correct viscosity or it was for petrol engines. It ran great for the first couple days. Then started shuddering. Once that happened I noticed that the oil gauge was reading almost nothing and would only go up when I was going up a hill at high revs. Didn't notice any excessive smoke coming out of the exhaust but it smelled like an old diesel heater. So based off of that, it was either my oil pump failed or I had a light weight viscosity oil. Changed it out with a 20w40 for diesels and my gauge immediately started reading I had oil pressure. Ranging between the 2 and the 4, idle and driving. I hope I caught it in time and caused no permanent damage. I did not see any metal in the oil. And so far there has been no significant shuddering.
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