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Old 12-13-2017, 09:21 PM   #1
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Isc 350 8.3

My manual says I need 22 qts if I have a stiffener? What’s it look like?
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Old 12-13-2017, 10:06 PM   #2
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I have the same engine and had no idea, so had to look it up

Here is what I found: Engine Block Stiffener
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Old 12-13-2017, 10:14 PM   #3
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My manual says I need 22 qts if I have a stiffener? What’s it look like?
I have not heard that term but 22 qts sounds good. I would add the 20 qts, run the engine for a bit, check the filter for leaks, shutdown and check the oil level after it sits for a few minutes.
Then add one at a time and check. You do not want to overfill. I run mine abut 1/4" below the full mark and it might use a quart in 5-6K. If I fill it to the full mark it will use that quart in less than 1K.

Once you reach that point you will know exactly how much oil to add for the next time.
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Old 12-13-2017, 10:31 PM   #4
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According to a friend of mine that is a certified Cummins tech, he says that we don't have to worry about the block stiffener in a motorhome.
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Old 12-14-2017, 08:48 AM   #5
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... I would add the 20 qts...You do not want to overfill. I run mine abut 1/4" below the full mark and it might use a quart in 5-6K. If I fill it to the full mark it will use that quart in less than 1k...
Ditto what Dnnis said.
Anything over 20 qts in mine will be blown out the vent in short order.
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Old 12-15-2017, 07:47 AM   #6
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Don't know anything about a "stiffener" but mine has a 21 qt sump. Some have 24 qt and you have to really hammer on truck service places to get them to understand you need only 21. I emphasize 21 qt when I take it in for service and tell them I WILL NOT PAY for more than 21 qt. I also have engine oil capacity written on an upright in the engine compartment.
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Old 12-15-2017, 01:54 PM   #7
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Hi to all; Changed the oil and filter in my 01 Windsor with the 350 H.P. 8.3 ISC back in February of 2016. First change for me on this coach. Someone had written in pen on the valve cover,22 quarts. With the Fleetguard oil filter in place I put 20 quarts in and ran the engine. Let sit for .5 hour and checked. Only added one more quart and that made it just below full on the stick. Seems to me that Dennis45 has got it pegged. Have a starting point and go from there to get to the proper level. Doing my own changes now but on my previous 2000 Windsor that had a 350H.P 8.3 ISC, the only people who could put the right amount of oil in that coach was my local Cummins shop. Everyone else I used over filled the crankcase by at least 3+ quarts and left a mess. Kind of why I try to do it myself now.
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Old 12-19-2017, 11:24 AM   #8
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Not to hijack the thread, but who's your favorite vendor for fuel, air, and oil filters? We bought an 01' in July with the ISC and I'll be changing all of those items.
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Old 12-19-2017, 01:35 PM   #9
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Not to hijack the thread, but who's your favorite vendor for fuel, air, and oil filters? We bought an 01' in July with the ISC and I'll be changing all of those items.
FleetGaurd off of Flea Bay!!!!
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