Is this oil good to use

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Old 12-10-19, 12:31 PM
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Is this oil good to use

I picked up a 2.5 gallon jug of 15W40 Synthetic oil for my Kubota 5640 tractor. The oil says it meets all the C ratings, including CJ-4. My maintenance manual says "The CJ-4 engine oil is intended for DPF type engines, and cannot be used on this tractor."

I am not sure if meeting the sepcs for CJ-4is the same as CJ-4 engine oil.

Can anyone shed light on this?
 
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Old 12-10-19, 12:56 PM
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The question would then be what type of engine do you have in your 5640, and what type of oil is recommended for it?
 
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Old 12-10-19, 01:35 PM
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The answer to your question confuses me further.
I have an external EGR (exhaust gas recirculation) engine. It specifies CF or CI-4 oil is to be used with Class CF-4, CG-4 and CH-4 engine oils cannot be used on EGR type engines.

So I seem to be back to trying to determine if an oil spec is the same as an oil type.

PS: I have previously been using DELO 400 without any knowledge beyond the viscocity numbers 15W40.
 

Last edited by lakeseed; 12-10-19 at 01:45 PM. Reason: error
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Old 12-11-19, 04:24 AM
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You don't identify your source of info. Have you checked this info with a dealer or US Kubota distributor?
 
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Old 12-11-19, 05:57 AM
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I deleted my post as I no loner agreed with it fully.
 

Last edited by Tony P.; 12-11-19 at 08:52 AM.
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Old 12-11-19, 11:36 AM
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The letters denote an API service category.

If you have an engine manual that specifically says NOT to use CJ-4, they must have a good reason. I assume it would have something to do with high sulfur and maybe a higher potential for the oil becoming slightly corrosive.

However if you are so worried about this I don't know why you are asking if you were already running Delo 400 (which I assume is a CK oil) if your manual specifies CF or CI. In some cases old oil class ratings are simply obsolete and they get discontinued and are replaced by newer oil class ratings that are supposed to be equal to or superior to the previous class rating.

Example... I'm probably not going to find type SD/SE 10w/40 oil to use in my 74 Mustang unless my grandpa has got a few quarts in his garage left over from the 70s. But whatever the store currently sells is (supposedly) far superior in quality performance and longevity to what was sold back then. Oil class ratings are backward compatible.

Generally oils that say they meet or exceed a certain standard (all C ratings) are fine no matter what.

Type C oils are for diesel engines. Type S oils are for gasoline engines.

Here is a page that gives a pretty good explanation.
 
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