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Old 07-14-2015, 01:01 PM   #1
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Oil weight 15/40 or 10/30 Cat C9 engine

During my last oil change Cat recommended switching to 10/30 oil from the 15/40 weight I had been using. Their reasoning was that the Huei pump does double duty in this engine and 15/30 oil allows better flow for the injectors and the Huei pump. We travel primarily in the west coast and never exceed the temp range the 10/30 would cover. We have 120k on our coach and have replaced the Huei pump once along with a couple of injecters.
Has anybody made this change and what have been the results?
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Old 07-14-2015, 02:05 PM   #2
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You would only learn "results" if something went drastically wrong, e.g. the engine seized or another pump blew out. Otherwise, it takes another 100k or more miles to be able to detect any increase in engine wear, and even that would require a tear-down..
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Old 07-14-2015, 04:41 PM   #3
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If I remember correctly my CAT manual says if you are operating in temperatures above 104 the 10/40 is necessary.
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Old 07-14-2015, 05:25 PM   #4
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I'm on diesel number four and have always used 15W40 (Rotella).
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Old 07-14-2015, 05:33 PM   #5
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aa
Has anybody's a made this change and what have been the results?[/QUOTE]

Wayawaa
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Old 07-15-2015, 01:00 AM   #6
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I'm running Cat 10/30 in my C-7. Supposed to be better for the injectors and the pump.


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Old 07-17-2015, 09:24 AM   #7
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I would go with the 10w30 they suggest.
I am a Ford Diesel tech and know the 6L with heui injectors ran better and injectors lasted longer with the lighter oil.
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Old 07-17-2015, 09:38 AM   #8
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Quote:
Originally Posted by rvsurfer View Post
During my last oil change Cat recommended switching to 10/30 oil from the 15/40 weight I had been using. Their reasoning was that the Huei pump does double duty in this engine and 15/30 oil allows better flow for the injectors and the Huei pump. We travel primarily in the west coast and never exceed the temp range the 10/30 would cover. We have 120k on our coach and have replaced the Huei pump once along with a couple of injecters.
Has anybody made this change and what have been the results?
rvsurfer
Who is the "Cat" that recommenced switching oils?
For the CORRECT answer call the Caterpillar RV Hotline, (877 777-3126) with your engine serial number and ask...(IMO nobody knows your particular engine like the manufacturer).
Mel
'96 safari, 3126 Cat
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