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Old 07-10-2011, 11:09 AM
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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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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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Old 07-10-2011, 11:26 AM
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Quote:
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
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Old 07-10-2011, 06:57 PM
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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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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)
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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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