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With diesel engines and ULSD fuel and DPF with DEF the demands on the engine oil have changed and so have the API standards. Any oil that meets the API standards is good enough and has an excellent base stock. The difference in motor oils is in the additives which make up 25% of what is in a gallon of oil.

 

The only advantage with a synthetic is the ability to run with a 5W oil if you live in an area with subfreezing temperatures for months at a time. Otherwise the dino is actually better. Dino is better as when you change out the oil you are removing the old oil with soot and sludge and replacing it with new oil with a new supply of additives. Better to change out dino oil and filter every 7500 miles than a synthetic every 15000 miles. More often than every 7500 miles is a complete waste of money with current engines and oils.

 

For my diesel I use the Valvoline Premium Blue with is one the highest rated in independent fleet tests of the dino oils and ranks above most synthetic oils with their additives mix. I also like that I can get an oil change with 10 qts. of oil and the oil filter for $79 at my local Sears center.

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