Oil preferences

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Mobil Delvac 1 5W-40 is a fully synthetic supreme performance heavy duty diesel engine oil that helps extend engine life while providing long drain capability and fuel economy for modern diesel engines operating in severe applications. Mobil Delvac 1 utilizes state-of-the-art technology to deliver exceptional performance in modern low emission engines, including refrigerated units, as well as older, well-maintained engines. Mobil Delvac 1 5W-40 is recommended for use in a wide range of heavy-duty applications and operating environments found in the on-road transport and off-road mining, construction, and agricultural industries. Mobil Delvac 1 also meets the API SL specification for gasoline engines used in mixed fleets.

 

[whatabudro]

This stuff:
View attachment 606

 

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Guess they changed the jug since my last oil change but Delvac 1 is the stuff. It has been right at one year since my last oil change. I might change it one of these days just because but in a year I have only went about 3400 miles or so. Most owners manuals say a mileage and a time like 3000miles/3 months for a change but I have never figured out how oil sitting in a oil pan for three months would ever wear out. I guess the oil companies might have stock in the auto manufactures or something. I usually go 5000 miles no matter how long it takes to get there. I think since the truck was new this might be the longest time that it took to put 5000 miles on.