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Old 03-18-2018, 05:50 PM   #1
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Oil Level

08 Diplomat 400hp ISL Cummins bought the coach with resent oil change with records oil level on the full mark,had 2 yearly changes at local truck shop oil level on full mark told them both times the engine took 24qt or 6 gal. This year at home with plenty of time decided to do the job myself. Drained oil changed filter and added the 6 gal as stated in both my coach and engine manuals and the level on the dip stick is about a quarter of the way down on the stick. Is it possible I have a larger oil pan or have the shops been overfilling?
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Old 03-18-2018, 05:55 PM   #2
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Quote:
Originally Posted by mccrob View Post
08 Diplomat 400hp ISL Cummins bought the coach with resent oil change with records oil level on the full mark,had 2 yearly changes at local truck shop oil level on full mark told them both times the engine took 24qt or 6 gal. This year at home with plenty of time decided to do the job myself. Drained oil changed filter and added the 6 gal as stated in both my coach and engine manuals and the level on the dip stick is about a quarter of the way down on the stick. Is it possible I have a larger oil pan or have the shops been overfilling?


Just changed my oil and filter (17 ISL Cummins 8.9 with 400hp). Took 25 qts to the full line, and several checks since confirm itís full
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Old 03-18-2018, 06:04 PM   #3
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Quote:
Originally Posted by mccrob View Post
08 Diplomat 400hp ISL Cummins bought the coach with resent oil change with records oil level on the full mark,had 2 yearly changes at local truck shop oil level on full mark told them both times the engine took 24qt or 6 gal. This year at home with plenty of time decided to do the job myself. Drained oil changed filter and added the 6 gal as stated in both my coach and engine manuals and the level on the dip stick is about a quarter of the way down on the stick. Is it possible I have a larger oil pan or have the shops been overfilling?
Is it between the add and fill line?
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Old 03-18-2018, 06:05 PM   #4
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Is it between the add and fill line?


Right on the full line
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Old 03-18-2018, 06:06 PM   #5
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Just changed my oil and filter (17 ISL Cummins 8.9 with 400hp). Took 25 qts to the full line, and several checks since confirm itís full


Is it supposed to take 24 or 25?
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Old 03-18-2018, 06:50 PM   #6
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Is it between the add and fill line?


Yes about a quarter of the way down. If itís a gallon from full to add marks itís a quart low
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Old 03-18-2018, 06:53 PM   #7
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Did you fill the filter with oil before installation? Not that you should, but that could account for the quart difference.
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Old 03-19-2018, 07:50 AM   #8
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Is it supposed to take 24 or 25?


I had been told by Freightliner and Cummins it holds 27, so my dipstick may be off.
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Old 03-19-2018, 07:58 AM   #9
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I had been told by Freightliner and Cummins it holds 27, so my dipstick may be off.
i have seen this many times over the years.i would take the engine serial number to cummins, put in exactly what they call for and remark the dip stick to that
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Old 03-19-2018, 08:48 AM   #10
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Go to Cummins Quick Serve, register, enter motor serial number. It will show capacity. Mine is 20 low, 24 high plus 4 for filter.

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Old 03-19-2018, 08:56 AM   #11
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With my '02 DSDP and ISC 350 the engine liked the level midway between low and full. If I filled to the full mark it threw oil out til it got to the midway point, then it stayed there.
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Old 03-19-2018, 09:32 AM   #12
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+ 1 on the quick Cummins quickserve, anyone with a Cummins power vehicle should have an account.

Best part is it's free
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Old 03-19-2018, 10:34 AM   #13
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Originally Posted by mccrob View Post
08 Diplomat 400hp ISL Cummins bought the coach with resent oil change with records oil level on the full mark,had 2 yearly changes at local truck shop oil level on full mark told them both times the engine took 24qt or 6 gal. This year at home with plenty of time decided to do the job myself. Drained oil changed filter and added the 6 gal as stated in both my coach and engine manuals and the level on the dip stick is about a quarter of the way down on the stick. Is it possible I have a larger oil pan or have the shops been overfilling?
As others have already said you should confirm the capacity from Cummins by the engine serial number.

Thing is with these coaches, the dipstick is supplied and installed by the chassis/coach maker and it is not always accurate. Close, but we know that close only counts in Horseshoes and Handgrenades.
My neighbor has the same vintage coach as yours. The previous owner had it serviced before he took possession. He made a short trip of less than a 100 miles, parked and noticed a puddle of oil on the ground. The previous owner authorized him to take it to Cummins to check it out. Cummins said it was a bad rear main seal and replaced it. Then he drives it from Cummins to home and yes, it still leaked oil on his garage floor.
He relates this to me so I had a look and first thing I check is oil level. Sure enough, it's just over the full mark.
After discussions with Cummins, they authorized him to take it to a local shop for further inspection. The locals, on advice from the owner, drained the oil and refilled it with the exact amount that Cummins specified. Turns out, it was overfilled by nearly two quarts when showing full on the dipstick. The Cummins shop had actually filled it beyond the full mark by about one quart.
The dipstick was remarked for the correct level and no more oil leaks.

Point being, the so called Full Mark just might not be correct. If the shop doing the oil change is not paying attention, the engine can easily be overfilled.

How's that killer dog, Izze?
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Old 03-21-2018, 09:00 AM   #14
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As others have already said you should confirm the capacity from Cummins by the engine serial number.



Thing is with these coaches, the dipstick is supplied and installed by the chassis/coach maker and it is not always accurate. Close, but we know that close only counts in Horseshoes and Handgrenades.

My neighbor has the same vintage coach as yours. The previous owner had it serviced before he took possession. He made a short trip of less than a 100 miles, parked and noticed a puddle of oil on the ground. The previous owner authorized him to take it to Cummins to check it out. Cummins said it was a bad rear main seal and replaced it. Then he drives it from Cummins to home and yes, it still leaked oil on his garage floor.

He relates this to me so I had a look and first thing I check is oil level. Sure enough, it's just over the full mark.

After discussions with Cummins, they authorized him to take it to a local shop for further inspection. The locals, on advice from the owner, drained the oil and refilled it with the exact amount that Cummins specified. Turns out, it was overfilled by nearly two quarts when showing full on the dipstick. The Cummins shop had actually filled it beyond the full mark by about one quart.

The dipstick was remarked for the correct level and no more oil leaks.



Point being, the so called Full Mark just might not be correct. If the shop doing the oil change is not paying attention, the engine can easily be overfilled.



How's that killer dog, Izze?


Izzie is just fine only bites Elaine about twice a week
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