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· Super Moderator
2005 GMC 2500HD
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That’s a clean 25 year old rig.
Many fellas swear by adding some 2-stroke oil when fueling. The new low sulfur diesel(15ppm) doesn’t provide enough lubricity to the fuel system on older rigs designed to run on 500ppm of sulfur. You can also check with vendors here. Kennedy diesel for example offers different options of fuel additives.
On oil additives, someone else will have to chime in.
 
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· Administrator
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As mentioned above, you can add some TC W3 two-stroke oil ( 1 ounce of oil, per every 2 gals of fuel in the tank )
Oil pressure is ok from what you posted. Just run a good synthetic15w40 like Shell Rotella
 
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