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Old 05-05-2010, 10:08 AM   #1
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Oil looks black as night! normal?

Checked my oil level via dipstick yesterday. Oil and filters were changed exactly 9 months & 1,100 miles ago. Bus runs great and level looked good... just AMAZED how black it looked. Is this normal?

Engine = Caterpillar 3176 turbo (325 hp)

Oil pressure when warm @ speed approx. 43 lbs.

Oil analysis resulted positive (green check mark) all normal. (at time of oil change)

I'm kind of new to diesel engines but LOVE them!

When I change the oil in my nissan gas burner for months afterwards the oil still looks clean. I am dealing with a COMPLETELY different animal here aren't i?

fkloster = Fritz & Erin (& Lucy the Weim)
1991 Beaver Marquis 40' (1,225 ft. lbs. torque)
2011 JGC Overland Summit Toad / U.S Gear Brake
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Old 05-05-2010, 10:19 AM   #2
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Black is normal. A diesel's oil will turn black after a short time.

2001 National Tradewinds 7370 300 Cat
2011 Jeep Wrangler Unlimited Sport
Officially fulltiming. The Journey Begins
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Old 05-05-2010, 10:29 AM   #3
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Black is good. It means the oil is removing contaminants.
Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP

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Old 05-05-2010, 10:43 AM   #4
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If you just change the oil, start it and let it run 10 minutes it will be just as black. This is normal for a diesel.
Brian, Loretta & Daisy (Golden Retriever)
2008 Holiday Rambler Endeavor 40 PDQ , ISL 400
2014 Ford Explorer toad
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Old 05-05-2010, 11:18 AM   #5
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Yay, now I don't have to ask the question!

2000 40' Tiffin Allegro Bus \ 2003 Chaparral 260 SSI
1988 53 x 14 Skipperliner \ 1995 32' Party Cruiser
1984 Goldwing Aspencade \ 1976 Harley Sportster
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Old 05-05-2010, 02:12 PM   #6
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Thanks guys! I'm learning stuff every day. I LOVE THE BIG IRON DIESELS!

fkloster = Fritz & Erin (& Lucy the Weim)
1991 Beaver Marquis 40' (1,225 ft. lbs. torque)
2011 JGC Overland Summit Toad / U.S Gear Brake
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