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Username Post: Oil Change: Increasing oil viscosity as engine mileage increases?        (Topic#351520)
Posts: 19

Age: 28
Reg: 04-09-12
06-11-18 01:50 PM - Post#2736620    

My truck:

2004 2500HD 6.0L V8 Gas

Over the past few years, my engine has been burning more oil than when it was young. The engine is rated for 5w-30, but would it be beneficial to use a 10w-30 or 15w-40 for my next oil change?

Valued Contributor
Posts: 3008

Age: 45
Loc: West Michigan
Reg: 02-18-12
06-11-18 09:46 PM - Post#2736672    
    In response to HermSC

Are you sure it's not leaking?

99 K3500 RCLB

Frequent Contributor
Posts: 1072

Loc: Tennessee
Reg: 12-06-10
06-13-18 07:34 AM - Post#2736824    
    In response to HermSC

You may start using 10W30 and see if oil loss improves. It shouldn’t effect gas mileage very much if any.

You may also try using an engine oil designated for high mileage engines that has seal conditioners to rejuvenate aging seals and gaskets to help stop and prevent oil leaks. It comes in the same viscosities and synthetic or other.

Posts: 368

Loc: East Texas
Reg: 02-02-06
06-13-18 06:34 PM - Post#2736896    
    In response to HermSC

My company truck was bought at an auction with 52k miles on it. Now it has 359k miles and has had 15w40 in it the whole time. I have never added any oil between oil changes that are usually about 5000 mile intervals. I live in east texas so cold weather is really not much of a problem.


2003 S10 Blazer 4wd (wife's)
2001 S10 Crew Cab (wife's mail truck)
1996 K1500 (mine)
1979 GMC 3/4 ton 2wd 4spd with a "Gilley's" bumper sticker, my first brand new truck.
2006 K1500 Company Truck
2006 K2500 NV4500 4.10's

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