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Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) Everything related to the mechanical maintenance of the FR-S and BRZ


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Old 06-22-2016, 05:35 PM   #1
Crunk81us
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Diff and gear oil. Fill to overflow, or service manual capacity??

I am going to be changing my diff and gear oils again with lighter weight oil.

Last time i did them, i filled until the fill hole dribbled.

BUT

I fit a lot more in than the service manual recommends.

So what is the go here?

I dont want to have too much oil in there sapping power from my 86 series race car..

I have always filled to the fill hole before.

manual states 2.2 for GB and 1.1-1.2 for diff.

I fit appx 2.8-3l in GB and 1.5-1.6 in the diff
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Old 06-22-2016, 06:03 PM   #2
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Oh, I'd suggest you just fill them up till they won't take any more and call it good.


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Old 06-22-2016, 06:12 PM   #3
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Both are fine. If you want every ounce of performance, fill it to capacity as specified

-alex
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Old 06-22-2016, 06:20 PM   #4
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Both are fine. If you want every ounce of performance, fill it to capacity as specified

-alex
every ounce! yes every single one
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Old 06-22-2016, 10:56 PM   #5
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Verify they are level along both pitch and roll axes, fill until overflow, wait a bit, top them off to make sure. Don't overfill.
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Old 06-22-2016, 10:59 PM   #6
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Verify they are level along both pitch and roll axes
What about yaw though?
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Old 06-23-2016, 12:04 AM   #7
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What about yaw though?
Only needed when also reading lift, drag and thrust..
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Old 06-23-2016, 12:13 AM   #8
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What about yaw though?
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Only needed when also reading lift, drag and thrust..
Fucking peanut gallery... As soon as I submitted I knew I was gonna regret it.
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Old 06-23-2016, 01:15 AM   #9
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Fucking peanut gallery... As soon as I submitted I knew I was gonna regret it.

........not a red letter day for ol Ultramaroon .........


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Old 06-24-2016, 12:31 AM   #10
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........not a red letter day for ol Ultramaroon .........


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Old 06-24-2016, 09:47 AM   #11
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Fill until it comes out, then have a beer, then put the plug back in with a fresh crush washer.
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Old 07-06-2016, 11:49 AM   #12
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I just try to fill close to capacity indicated in shop manual.
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Old 08-18-2021, 05:59 PM   #13
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I just finished a clutch install, and I filled the transmission gear box until the oil started to seep back out the fill hole. I measured the oil remaining in the last bottle. Based on what’s left, I filled to about 2.6 liters. Will I have any issues with the extra fluid being in there or should I drain it and refill to 2.2L? Thanks
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