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Old 03-31-2011, 09:40 AM   #1
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Diesel engine Oil Analysis

Have any of you who have purchased used Diesel coaches had an engine oil analysis test done before you bought the coach ? I've had a couple people advise me to do it, but when I've mentioned it to dealers, they don't seem to know what I'm talking about .

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Old 03-31-2011, 09:50 AM   #2
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Did one after purchase using Blackstone Labs service.

Dealers probably do not want the oil tested.

Also if a test were going to occur, they would then have the oil changed so your sample would not likely be useful.

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Old 03-31-2011, 09:52 AM   #3
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Blackstone Labs will do it and they will send you the container free.
Blackstone Labs

Any of the local big factory diesel repairs shops for Cummins or CAT will know a local lab that can do it.
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Old 03-31-2011, 09:54 AM   #4
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dealers are great at playing "stupid"
In the diesel industry oil sampling is fairly common to do, also in the aircraft.
Then only problem with just doing an initial one is it only gets you started, and if there is something really wrong. In order to really know whats going on, excess wear, to much metal, you have to do several over a period of time to get an accurate picture of anything unusual.
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Old 03-31-2011, 10:25 AM   #5
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I agree. The oil analysis doesn't do much good if it is fresh clean oil. Hopefully the oil is black and in need of changing because that is when it contains the best evidence.

I will say that if the MH is low miles (less than 100K miles) the chances of being a bad motor is pretty slim. The worse thing that could happen would be freezing of the block in the winter. Most MH owners take care of their motors. Even if you pushed the oil changes to the limit it is still not going to ruin a motor. We diesel MH owners are a little paranoid about our motors and we take care of them a lot better than most big truck owners do and they get lots of miles on their motors.
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Old 03-31-2011, 05:32 PM   #6
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Before you put your "Pot of Gold" down on the unit and trust the oil analysis will give you a "Feel Good Feeling" read Maintenance Rant - History of oil analysis . You may change your mind of that feel good item.

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Old 03-31-2011, 07:48 PM   #7
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Oil analysis at every oil change for me on gen, engine oil, trans fluid at every change. Lets you know whats going on inside, if there is a problem it can be addressed at home instead of beside the road. It will also tell you about your oil change intervals to soon or to long, no need changing fluids just for fun especally on diesels, and allison trans with 6 gal of real costly fluid and filters.
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Old 03-31-2011, 08:26 PM   #8
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Also did one after purchase went to local Cat dealer bought sample test kit had results back in 10 days, all good! Also had Allison shop run diagnostics on tranny, also all good! Documentation good for ESP extended warranty also.
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Old 04-01-2011, 10:37 AM   #9
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If you want to use oil analysis as a diagnostic tool, you need to sample at every oil change or at established intervals if you are on an extended oil drain program. This will establish a pattern in wear metals so you can evaluate trends. Of course, any single analysis has the possibility of detecting an impending catastropnic failure; coolant in the oil. excess fuel in the oil or sudden rise in one of the critical wear metals.
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Old 04-01-2011, 02:20 PM   #10
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Don't do one and not going to do one.
Don't really care. If it going to have a catastrophic failure, I wouldn't know how to stop it from happening.
And probably no one else could stop it.
Hard to stop a blow out on a tire before it happens.

It will be it will be 2017 or 18 before it has 100K on it.

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