Synthetics Oil and Diesels

[Squinguy]

Probably been discussed before but just purchased a coach with Cat C7 and considering switching to full syn, Pros and Cons?

[Goodspike]

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.

[Squinguy]

2005 Cat C7

[Cataska]

Seems if you change oil once a year as most recommend you would be throwing money away i use delo 15x40

[imnprsd]

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.

[LPD218]

Hello,

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.