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Old 09-17-2020, 05:21 PM   #1
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Synthetics Oil and Diesels

Probably been discussed before but just purchased a coach with Cat C7 and considering switching to full syn, Pros and Cons?
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Old 09-17-2020, 06:17 PM   #2
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What's the issue? It appears that unlike the Onan generator discussed recently, that they do spec synthetic oils.

Also, it would probably help to specify a year for this engine. There are synthetics designed for modern diesel emissions equipment. I'm not sure the same is true for conventional oils.
2019 2106 DS
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Old 09-17-2020, 07:04 PM   #3
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2005 Cat C7
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Old 09-18-2020, 08:08 AM   #4
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Seems if you change oil once a year as most recommend you would be throwing money away i use delo 15x40
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Old 09-19-2020, 11:26 PM   #5
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I once switched to 5-40W Shell Rotella full syn and when I adjusted my valves the engine head was really clean, but then I started to see more blow-by. So I switch to Chevron Delo 400 15-40W full syn and that's what I run now in both my generator and engine. I don't recommend 5-40W for warm weather driving. The 15-40W is best for spring -summer-fall driving above 40F.
2004 Itasca Horizon ISK-40AD, 350HP Cummins 8.3L
115K miles and the best of 3 Diesels I have owned thus far!
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Old 09-26-2020, 04:30 PM   #6
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I have have a C7 in my 2004 Itasca and use Shell Rotella T5 10w30 which is a blend. I change oil every 6 months or 3000 miles. One of the forums recommended 10w30 as being easier on the heuy pump. I test the oil once a year. So far so good.
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2004 MERDIAN 36G Freightliner & CAT C7 330
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