What's the consensus on burning new oil a few quarts a tank? - Ford Powerstroke Diesel Forum
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Old 07-12-2014, 11:19 AM
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What's the consensus on burning new oil a few quarts a tank?

I've got a huge assortment of random auto and motorcycle oil laying around that's not going to get used any time soon as it's for vehicles I no longer have (and the current fleet wouldn't appreciate it - my wife's car takes 0W5 or some other water-like oil).

Is there any real harm likely to come from throwing a quart or two of new oil (not used stuff) in the tanks every fillup? It's from about 5W30 to straight 50 weight, with some 80W90 gear oil around as well.

I'm trying to get the stuff sold cheap, but I haven't had much interest, and don't *really* want to just throw it all out in the waste oil bin...
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Old 07-30-2014, 09:49 AM
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I toss a quart of new oil, 5w30, 10w30 in each full tank. It's good for lubrication of the injectors - or so I've been told. There was a thread with test results from all kinds of oil including 2 stroke, but I could not find it to re-post.
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Old 09-02-2014, 05:51 AM
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That study is the "Spicer" study, I think, and is 8 to 10 years old. A Google will probably find it. It's been widely quoted on Duramax, Cummins and Volkswagen diesel forums, and originated on one of them.

That study does test a variety of additives, including two-cycle ashless oil. The two-cycle oil was shown to increase lubricity in today's "dry" ultra-low-sulfur diesel. But it's important to note that the ashless two-cycle oil is actually designed for burning in an engine, and does not have such potential problems as causing deposits in the top end of the engine.

In contrast, engine oil was not designed to burn in a combustion chamber. It contains a lot of things that are good for bearings and such in the lower end of the engine, but not so good for valves, combustion chambers, etc. in the upper end where deposits can cause problems.

I keep my old unused engine oil for use in oil dispensers for door hinges and other things that can benefit from lubricants of just about any sort. I've got a supply that could last for generations the way I use it.
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Old 09-03-2014, 09:05 PM
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Run it.... I used to get "empty" 55 gallon drums of hydraulic oil, gear oil, ATF and basically any other petroleum oil you'd find around machines and drain them out when I cut the tops for burn barrels leading to sometimes 5 gallons in a drum. After I filtered the paint chips and little bit of metal I got in it I'd dump it in the tank like it was diesel. Never had an issue and still run straight veggie oil/whatever oil I can find all summer long in the truck.
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