Another "What Oil Thread"
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More Turbo
Joined: Jun 2023
Posts: 601
Likes: 253
Fuel dilution? If it is perceived or otherwise validated.
Cargo Master
Joined: Jul 2011
Posts: 2,664
Likes: 971
From: Walpole, MA
Possibly, however if you are experiencing enough fuel dilution that you are reducing the viscosity of a Xw-40 oil to the point were you have accelerated wear rates you are either running the oil far too long or you have a mechanical issue that the 50 top weight can help band aid but not address, IMHO of course. These things can run just fine on 30 top weight oil so a 5w40 shearing down to 12.4cSt isn't going to cause an issue in pretty much all cases, it needs to get pretty thin before wear rates really start to jack up.
Lead Driver
Joined: Feb 2022
Posts: 7,958
Likes: 4,039
Here is something to consider with temps and weights. The trucks have temp probes that tell you the engine oil temps. Use that to go on, not your ambient temps. With the massive cooling systems the trucks use, engine oil temps can remain pretty consistent and remain in the temp range for 40 weight, even in triple digit temps.
Rule of thumb for 50 weight oil is if oil temps are a sustained 275* or higher. 40W is good up to 275, with average temps hovering the 260* mark.
50W is great for the older lower tolerance engines, but todays engines are better off with 40W.
Rule of thumb for 50 weight oil is if oil temps are a sustained 275* or higher. 40W is good up to 275, with average temps hovering the 260* mark.
50W is great for the older lower tolerance engines, but todays engines are better off with 40W.
Lead Driver
Joined: Feb 2005
Posts: 7,923
Likes: 2,642
From: The Great State of Texas
No issue with wear rates here in Texas with either 10W30, 5W40 and 15W40 oils. As a matter of fact, I hear more 6.7PSD with spun bearing occur more in the colder climate areas and looking at the big picture, is probably been a bigger problem.
Lead Driver
Joined: Feb 2005
Posts: 7,923
Likes: 2,642
From: The Great State of Texas
Here is something to consider with temps and weights. The trucks have temp probes that tell you the engine oil temps. Use that to go on, not your ambient temps. With the massive cooling systems the trucks use, engine oil temps can remain pretty consistent and remain in the temp range for 40 weight, even in triple digit temps.
Rule of thumb for 50 weight oil is if oil temps are a sustained 275* or higher. 40W is good up to 275, with average temps hovering the 260* mark.
50W is great for the older lower tolerance engines, but todays engines are better off with 40W.
Rule of thumb for 50 weight oil is if oil temps are a sustained 275* or higher. 40W is good up to 275, with average temps hovering the 260* mark.
50W is great for the older lower tolerance engines, but todays engines are better off with 40W.
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powerstroke8806
1999 - 2003 7.3L Power Stroke Diesel
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Jun 21, 2016 07:36 AM
