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Schaeffer's 9000 - 5w40 vs. 10w30 #4625481
01/05/18 11:12 PM
01/05/18 11:12 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline OP
Alex_V  Offline OP
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Could those of you with more oil knowledge than I possess look at these two data sheets and explain what, exactly, the biggest functional differences are between these two oils? My '82 Benz with an IDI turbo diesel doesn't use a lot of oil and holds 1.5 bar at idle so, especially in the colder months, if the differences aren't ones that will be pushing any limits I might go from 5/40 down to 10/30.

It's a half-million mile engine with 160K on it so I don't want to do any "experiments" - it seems the majority of owners are still running 15w40, and the other portion 5w40. I believe in the "as thick as necessary, as thin as possible" rule so I've been curious about a diesel 10w30 since I got the car.

The cSt numbers are smaller - both 40* and 100* - on the 30 weight, and pour point is the same. Does that mean the 5w40 isn't actually thinner on the cold side?


Last edited by Alex_V; 01/05/18 11:13 PM.

To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Schaeffer's 9000 - 5w40 vs. 10w30 [Re: Alex_V] #4626424
01/06/18 09:21 PM
01/06/18 09:21 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline OP
Alex_V  Offline OP
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
No insight?


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Schaeffer's 9000 - 5w40 vs. 10w30 [Re: Alex_V] #4627318
01/07/18 06:51 PM
01/07/18 06:51 PM
Joined: Dec 2009
Posts: 26,367
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline
Joined: Dec 2009
Posts: 26,367
Regina, Saskatchewan, Canada
The pour point is irrelevant. The 5w-XX will pass cold cranking and MRV tests where the 10w-XX will not, full stop. You can even verify that on the data sheets you posted. Either would be a suitable lube, though the 5w-40 does have a significantly higher HTHS. The HTHS of the 10w-30 does, of course, meet the minimum standards of what would be specified for the vehicle.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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