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I just purchased a farm a few miles from my currant home in Pa. Im pulling my dump and deckover trailer back and fourth. Im using Delo® 400 XLE Synblend SAE 10W-30. My truck runs great on it and I change my oil every 3,500 miles. Im doing very short runs and pulling pretty heavy loads back and fourth. My question is since I change it every 3,500 miles does it matter to change over to 5w-40? I figured the 10w-30 will hold up fine since Im changing it out at 3,500 miles. I was thinking maybe I should get an oil test done to see how its working.
 

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Your oil test should reveal that you may be able to extend your changes to, say, 5000 miles. With your frequent oil changes, synthetic might be throwing money away. On the other hand, you qualify for Severe Duty which indicates 5W40 synthetic, so you would break even with the longer intervals and could use that time for something more fun.
 

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The UOA will give you the health of the oil and let you know where you stand. With short runs, you may experience higher levels of fuel dilution and unfortunately, no matter which oil you choose, the oil way to counteract dilution is to change the oil. The cost difference between an OC with Chevron XLE (10W-30 synblend) and Chevron LE (5W-40 full synthetic) is $12 (using pricing at my local WM) so if you decide to go full synthetic, it is not like you will be spending a huge amount of extra money.
 
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