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Old 03-03-2024, 02:01 PM   #1
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Join Date: Jul 2020
Location: Great Lakes
Posts: 307
Year: 2005
Coachwork: Thomas
Chassis: Freightliner
Engine: Cat C7 300/800
Rated Cap: 31
2005 Cat C7 oil change

Oil prob has 1000 miles on it from last years driving but since its a HUEI I want to change it and the filters myself

I believe this is the shallow sump cat so i need a 5 gal bucket of 15/40
As well as 2 filters?

I snapped this pic, maybe someone can double check me.
If you have a favorite oil filter i can order please let me know.

Cheers!

Peter
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Old 03-03-2024, 07:51 PM   #2
Skoolie
 
Join Date: Aug 2021
Location: Santa Fe
Posts: 135
Year: 2007
Coachwork: Thomas
Chassis: 31 ft. HDX
Engine: CAT C7 250 hp
Rated Cap: 36,300 GVW
The smaller filter is a coolant filter. Don't change it unless you change the coolant.
Use a good quality filter, CAT filters are really good, especially on a HUEI system.
I think you may have the 8 gallon oil pan. Make sure your drain pan is larger enough!
I use 5-40 Mobil ! in my C7, starts much better. 15-40 had to warm-up 15 minutes before it ran smoothly.
A CAT Diesel tech told me most HUEI failures were caused by poor quality/dirty/too thick oil.
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Old 03-04-2024, 11:55 AM   #3
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Join Date: Jul 2020
Location: Great Lakes
Posts: 307
Year: 2005
Coachwork: Thomas
Chassis: Freightliner
Engine: Cat C7 300/800
Rated Cap: 31
Thanks @jimmythomas , much appreciated!


so the bigger filter then is the oil filter, and there is only 1, as i understand it.
Ill look for a CAT oil filter, as well as a bucket of 15/40 Mobil synthetic oil.
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