15w40 vs 5w40 ?

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Feb 27, 2011 | 09:24 AM

#11

cougar

Diesel Enthusiast

Joined: Feb 2011

Posts: 470

Likes: 29

From: Alaska

I use them both. Up here, where it can get a little cold I use 5-40 synthetic in the winter. In the summer I use 15-40 non synthetic. The thinner oil makes a big difference when your on the minus side of zero.

Feb 28, 2011 | 09:22 AM

#12

GuyWithA24Valve

Diesel Wrench

Joined: Feb 2010

Posts: 933

Likes: 95

From: Lynd, Minnesota

I run Rotella 15w40 in the summer, and Rotella 5w40 in the winter. I ran 15w40 once in the winter and it took noticeably longer to build oil pressure

Feb 28, 2011 | 09:23 AM

#13

Farmboy 2.0

Diesel Bomber

Joined: Feb 2010

Posts: 2,386

Likes: 162

From: N. Idaho

I run schaeffers 5w-40 synthetic oil year around

Mar 14, 2011 | 11:06 AM

#14

steved

Diesel Wrench

Joined: Mar 2007

Posts: 582

Likes: 36

From: Mohrsville, PA

Typically 5w40 is synthetic and 15w40 is conventional...either one will work. Like Scott, I run Schaeffer's 5w40 year round...I got 24k on this fill, got to change it tonight!!

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