15w40 vs 5w40 ?

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#11

02-27-2011, 09:24 AM

cougar

Diesel Enthusiast

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Location: Alaska

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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.

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#12

02-28-2011, 09:22 AM

GuyWithA24Valve

Diesel Wrench

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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

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#13

02-28-2011, 09:23 AM

Farmboy 2.0

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I run schaeffers 5w-40 synthetic oil year around

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#14

03-14-2011, 11:06 AM

steved

Diesel Wrench

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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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