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#2689395 - 07/20/12 12:00 AM Re- using oil from a race car
Hendo Offline


Registered: 01/10/12
Posts: 30
Loc: Australia
Hi All

Here's the question. At Uni, we build a car for a competition called FSAE. Pretty much design and build a car from scratch to race against other Unis. We run a R6 motorbike engine and use moto specific oils and have tried 5w30 (motul 300v), 10w40 and 20w60 oils to do get data for the car (we're having surge problems)

Each fill (4l, custom dry sump) is in there for less than 5 hours. I have filtered and kept the used oil, and I'm after people's opinion on using the oil again in road cars (mostly beaters)

How badly does racing affect the oil? I'd guess it has sheared a little and discolored due to high temp, it just seems a shame to waste double ester oil after 5 hours use! what's the consensus?

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#2689396 - 07/20/12 12:04 AM Re: Re- using oil from a race car [Re: Hendo]
tommygunn Offline


Registered: 01/27/11
Posts: 3061
Loc: usa
Depends on the kinda racing really.

I dunno. For beaters? Fine. But its impossible to know what kinda fuel dilution the oil may have suffered.
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#2689397 - 07/20/12 12:05 AM Re: Re- using oil from a race car [Re: Hendo]
dave1251 Offline


Registered: 07/15/05
Posts: 7621
Loc: Maricopa, AZ
Without a analyst my biggest concern would be fuel dilution. But if we are talking oil for a beater I would not worry about it too much especially if you are not attempting extended OCI's. I am telling what I would do in this situation. But I do a lot of things I do not recommend others to attempt.
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#2689404 - 07/20/12 12:18 AM Re: Re- using oil from a race car [Re: Hendo]
Hendo Offline


Registered: 01/10/12
Posts: 30
Loc: Australia
As far as fuel dilution goes, we run the engine leaner than factory (minimum 13:1 a/f ratio) because part of the competition scoring is fuel efficiency. I'm guessing this means fuel dilution is less of a problem...

The racing we do is autocross, laps around a kart track with heaps of cones. Each run is short, <20mins


Edited by Hendo (07/20/12 12:20 AM)

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#2689406 - 07/20/12 12:20 AM Re: Re- using oil from a race car [Re: Hendo]
jjcom Offline


Registered: 09/19/11
Posts: 181
Loc: Illinois
If you're not running them real rich, or running them extremely hot for a long time, more than likely I'd say the oil still is "ok". I wouldn't throw it in a good car, but if it's one thats drinking oil like it's water, then I'd say you're fine.
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#2689407 - 07/20/12 12:21 AM Re: Re- using oil from a race car [Re: Hendo]
Kuato Online   confused


Registered: 10/23/05
Posts: 3829
Loc: Montana, 100km from Canada
Why not have a UOA done on the used oil? Then you will know for sure.
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#2689546 - 07/20/12 08:58 AM Re: Re- using oil from a race car [Re: Hendo]
gfh77665 Offline


Registered: 09/01/08
Posts: 2738
Loc: Southeast Texas
5 hours on the oil? Are you kidding? I would run that in a NEW car in a heartbeat! I don't think there would be any fuel dilution, but even if there was it would quickly burn off in normal highway driving. Thats good oil, just 5 hours old!

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#2689838 - 07/20/12 02:06 PM Re: Re- using oil from a race car [Re: Hendo]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
For a beater? Use that oil!
Thank you for recycling, too!

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#2689946 - 07/20/12 03:49 PM Re: Re- using oil from a race car [Re: Hendo]
TFB1 Offline


Registered: 09/03/10
Posts: 2766
Loc: VA
In a passenger car engine that has no real issues, any residual fuel should be evaporated in a couple hours of normal operation...

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#2691422 - 07/22/12 02:19 AM Re: Re- using oil from a race car [Re: Hendo]
Hendo Offline


Registered: 01/10/12
Posts: 30
Loc: Australia
Fantastic. Thanks for the advice, I will probably blend it with a HDEO for the beaters- ester + calcium cleaning goodness!

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#2691425 - 07/22/12 02:29 AM Re: Re- using oil from a race car [Re: Hendo]
Shannow Online   content


Registered: 12/12/02
Posts: 29180
Loc: a prisoner island
I don't think FSAE would beat the oil up too bad.

Which Uni ?

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#2691618 - 07/22/12 11:08 AM Re: Re- using oil from a race car [Re: Hendo]
GMorg Offline


Registered: 01/29/06
Posts: 2414
Loc: Mizzou-land
So, you have decided that the oil should not go back into the race engine and it may be OK for your beater. Where do you draw the line?

Also, how do you filter the oil? How large of a particle will make it through your filter?

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#2691768 - 07/22/12 02:04 PM Re: Re- using oil from a race car [Re: Hendo]
HTSS_TR Offline


Registered: 04/17/06
Posts: 14986
Loc: Lake Forest, CA
I filtered the used ATF from E430 to use in the LS400 leaking power steering this way:

Stub 5-6 paper towels tightly into the long ATF funnel, place the funnel into 5-qt jug then pour ATF into the funnel. The ATF is filtered at the rate of less than 1/4 pint per hour. For 4 quarts it took more than a day.
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#2691777 - 07/22/12 02:16 PM Re: Re- using oil from a race car [Re: HTSS_TR]
Highline9 Offline


Registered: 08/24/11
Posts: 516
Loc: ca.
Originally Posted By: HTSS_TR
I filtered the used ATF from E430 to use in the LS400 leaking power steering this way:

Stub 5-6 paper towels tightly into the long ATF funnel, place the funnel into 5-qt jug then pour ATF into the funnel. The ATF is filtered at the rate of less than 1/4 pint per hour. For 4 quarts it took more than a day.


wow a real redneck filter, I would do the same.
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#2691793 - 07/22/12 02:48 PM Re: Re- using oil from a race car [Re: Highline9]
HTSS_TR Offline


Registered: 04/17/06
Posts: 14986
Loc: Lake Forest, CA
Low cost (5-6 paper towels) with good filter, what not to like ? grin2
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'94 Lexus LS400
'00 MB E430
'04 Honda S2000
'06 Volvo V70
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