Oil amount needed for oil change with a Do88 oil cooler?

drwankel · 10-29-2024, 11:18 PM

For those of you who have a Do88 oil cooler, did you need to use extra oil during your oil changes? If so, how much more did you need?

Its not completely clear to me if when draining the oil out of the s65 for an oil change if the oil is drained out of the oil cooler or not. If it is, it seems to reason that with the larger capacity of the Do88 oil cooler, more oil would be required at each oil change.

My experience with Mazda rotary engines which have universally used an air/cooler since their introduction in the 60s (except the 83-85 12A) was that the coolers did not empty during an oil change. If I was filling the car after a rebuild, and the oil cooler and lines were totally empty, it would take an extra 2 quarts to get the oil level right vs a regular oil change.

Would be great to know what the story is for the s65, especially since it doesn't have a dipstick.

smokinjoe64 · 10-30-2024, 05:46 AM

Installed do88 'Big Pack' for 6MT this summer.
Typically use LM oil kit [illustrated].
My experience, no noticeable, 'additional' oil volume was required.

tdott · 10-30-2024, 08:01 AM

Always good to have an extra litre on hand, i'd buy one to keep even if you don't need it.

deansbimmer · 10-30-2024, 08:38 AM

Draining the sumps on an S65 does not drain the oil cooler.

The oil change volume is the same 8.8L for any S65 regardless of what oil cooler is present.

spammysammich · 10-30-2024, 09:02 AM

I’ve helped with the install drwankel let me know if you have specific questions.

t_win · 11-04-2024, 12:43 PM

No extra oil needed between oil changes. With that said, I generally run a full 9L of oil instead of the recommended 8.8L. I've never had an issue with the electronic oil reader reading high after an oil change.

Reasoning is people say running slightly overfilled is beneficial for track use. Whether or not that is true is to be debated.

Thumbie · 11-04-2024, 01:01 PM

Quote:

Originally Posted by t_win

No extra oil needed between oil changes. With that said, I generally run a full 9L of oil instead of the recommended 8.8L. I've never had an issue with the electronic oil reader reading high after an oil change.

Reasoning is people say running slightly overfilled is beneficial for track use. Whether or not that is true is to be debated.

I've heard the opposite from my shop, that the S65 doesn't like overfill. Haven't looked much into it other than that.

My S52, however, loves it haha.

10-29-2024, 11:18 PM	#1
drwankel Major 1616 Rep 1,337 Posts Drives: E92 M3, G20 M340i Join Date: Feb 2016 Location: Bothell, WA iTrader: (0)	Oil amount needed for oil change with a Do88 oil cooler? For those of you who have a Do88 oil cooler, did you need to use extra oil during your oil changes? If so, how much more did you need? Its not completely clear to me if when draining the oil out of the s65 for an oil change if the oil is drained out of the oil cooler or not. If it is, it seems to reason that with the larger capacity of the Do88 oil cooler, more oil would be required at each oil change. My experience with Mazda rotary engines which have universally used an air/cooler since their introduction in the 60s (except the 83-85 12A) was that the coolers did not empty during an oil change. If I was filling the car after a rebuild, and the oil cooler and lines were totally empty, it would take an extra 2 quarts to get the oil level right vs a regular oil change. Would be great to know what the story is for the s65, especially since it doesn't have a dipstick.
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10-30-2024, 05:46 AM	#2
smokinjoe64 Tailhooker 4056 Rep 1,680 Posts Drives: e92 M3 6MT Join Date: Nov 2008 Location: OC SoCal iTrader: (1) Garage List 2012 BMW M3 [9.75] 2025 Mazda MX-5 [0.00] 2003 BMW M5 [0.00] 2024 Ranger Raptor [0.00]	Installed do88 'Big Pack' for 6MT this summer. Typically use LM oil kit [illustrated]. My experience, no noticeable, 'additional' oil volume was required. Attached Images __________________ e92 M3 - Interlagos Blue \| Recaro GTs w/Fox Red Extended \|Carbon Leather BPM Stage II; SuperSprint: header-back, catless, nonresonated, F1s; Infinity Design CF intake; Partee Racing CF plenum; do88 coolers; Bilstein B16 kit w/EDC, monoball links; Brembo BBK; AutoSolutions SSK
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10-30-2024, 08:01 AM	#3
tdott S.FL S65 Specialist 4545 Rep 4,341 Posts Drives: M3 Join Date: Nov 2010 Location: South FL / 6ix iTrader: (4)	Always good to have an extra litre on hand, i'd buy one to keep even if you don't need it. __________________ N/A S65 Headers Before/After Dyno Results tdott's Spec E9X Build Thread https://www.youtube.com/@tdottme
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10-30-2024, 08:38 AM	#4
deansbimmer BimmerPost Supporting Vendor 4324 Rep 3,023 Posts Drives: 2011 E93 M3 Join Date: Nov 2014 Location: DFW, Texas iTrader: (17) Garage List 1988 E30 M3 [0.00] 2006 E46 M3 [0.00] 2024 X7 M60i [0.00] 2011 BMW M3 [0.00]	Draining the sumps on an S65 does not drain the oil cooler. The oil change volume is the same 8.8L for any S65 regardless of what oil cooler is present.
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10-30-2024, 09:02 AM	#5
spammysammich Lieutenant Colonel 3073 Rep 1,799 Posts Drives: 2009 E92 M3 Dakar Yellow II Join Date: Oct 2021 Location: Edmonds, WA iTrader: (0) Garage List 2009 BMW M3 [10.00]	I’ve helped with the install drwankel let me know if you have specific questions.
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11-04-2024, 12:43 PM	#6
t_win Enlisted Member 24 Rep 44 Posts Drives: e90 M3 Join Date: Dec 2022 Location: WA iTrader: (0)	No extra oil needed between oil changes. With that said, I generally run a full 9L of oil instead of the recommended 8.8L. I've never had an issue with the electronic oil reader reading high after an oil change. Reasoning is people say running slightly overfilled is beneficial for track use. Whether or not that is true is to be debated.
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