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post #1 of 6 Old 07-10-2011, 11:09 AM Thread Starter
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oil changes: synthetic vs reg oil

Since I'm new to this diesel arena, I have a question about the duration of oil between changes.
1. how many miles between changing synthetic oil?
2. How many miles between changeing conventional oil?

I've been told by a reputable diesel mechanic, that syn lasts 20,000 miles. I"ve always changes my conv. oils at 3-5000 mile intervals. I always change out the filter at the same time.

I changed the conv. oil with Mobil 1 syn. last fall, and have about 7000 miles on it now. If I change it I'm switching back to conv. oil just because of the cost factor. Too damn expensive to run syn. I figure on runnin syn in the winter, since it was discussed on here that syn is better for winter start ups.

What's your opinion?
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post #2 of 6 Old 07-10-2011, 11:21 AM
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I am currently running Amsoil 15-40 CJ4 at 10,000 miles... for the cost of 2 dino oil changes. If you spend the money on an oil analysis for a company like Blackstone Labs, you can find out for sure whats going on in your engine/oil and exactly how far you can strech it.

Personally, I highly reccomend a good quality synthetic, and use blackstone to monitor your engine/oil health.
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post #3 of 6 Old 07-10-2011, 11:26 AM
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Originally Posted by ToMang07 View Post
I am currently running Amsoil 15-40 CJ4 at 10,000 miles... for the cost of 2 dino oil changes. If you spend the money on an oil analysis for a company like Blackstone Labs, you can find out for sure whats going on in your engine/oil and exactly how far you can strech it.

Personally, I highly reccomend a good quality synthetic, and use blackstone to monitor your engine/oil health.
X2. An oil anlysis is the only way to know for sure how long you can take an oil. But I would defininatly say at least 7.5k

Allen
1999.5 F-350 7.3, six-speed

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post #4 of 6 Old 07-10-2011, 06:57 PM Thread Starter
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so there is no set amount of miles that is recommended?
how do you obtain getting your oil tested?
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post #5 of 6 Old 07-10-2011, 07:31 PM
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There are many places that can anylize your oil, but a place like blackstone labratories (I believe they are in Indiana) knows their stuff and can set you up good. I'd give them a call. (simple google search should bring them up)

Allen
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post #6 of 6 Old 07-10-2011, 07:45 PM
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I use blackstone and love it, 22.50 for a test and you can log in and see the results.... the 22.50 was a dramastop special. I even got a call cause the saw some stuff they wanted more info on....


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Remember, we aren't eating this stuff, we're turning it into diesel fuel. Your truck only cares about viscosity, acidity, and BTUs. Nothing else. -unknown?
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NC State law defines biodiesel as ''any fuel or mixture of fuels derived in whole or in part from agricultural products or animal fats or wastes from these products or fats.''
Exemptions from the excise tax
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