20W50 oil...
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Lead Driver
Joined: Jan 2006
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20W50 oil...
Just throwing this out there.....
Has anyone ever heard of newer diesel engines running on thicker oil than factory spec ?
As the power per displacement ratio goes up and up.... wouldn't it make sense to use a heavier oil to reduce wear?
Has anyone ever heard of newer diesel engines running on thicker oil than factory spec ?
As the power per displacement ratio goes up and up.... wouldn't it make sense to use a heavier oil to reduce wear?
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
Don't run thicker oil than needed. The thicker oil cannot flow into tighter tolerances, and will starve bearings. Also, there are higher pumping losses, and the filter bypass will open more often.
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Lead Driver
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I was reading a bunch of stuff to do with car manufacturing, and it seems like common practice to use lighter oil, and reduce engine lifespan in the name of fuel economy. More and more light oil use is to improve MPG, reducing engine lifespan.
I was just thinking it's almost crazy that diesel engine oil is almost the same as 20 years ago, and power output is about double.
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
The additives in the oils have changed a lot in the last 20years-
Diesels are really gentle on the bearings. While the compression is higher, the speeds are lower, bearings larger and the combustion event is spread over nearly four times the crank rotation as on gas engines (20* vs 5 or so).
Diesels are really gentle on the bearings. While the compression is higher, the speeds are lower, bearings larger and the combustion event is spread over nearly four times the crank rotation as on gas engines (20* vs 5 or so).
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Lead Driver
Joined: Jan 2006
Posts: 6,267
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The additives in the oils have changed a lot in the last 20years-
Diesels are really gentle on the bearings. While the compression is higher, the speeds are lower, bearings larger and the combustion event is spread over nearly four times the crank rotation as on gas engines (20* vs 5 or so).
Diesels are really gentle on the bearings. While the compression is higher, the speeds are lower, bearings larger and the combustion event is spread over nearly four times the crank rotation as on gas engines (20* vs 5 or so).
Sure, but with 6.4's and 6.7's having more metals in oil samples than 7.3's, it's pretty obvious that the newer engines are pushing the envelope as to how much stress the same oil will hold...
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