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#4758752 - 05/16/18 12:22 PM Do I really need racing oil?
Bxnanaz Offline


Registered: 11/28/17
Posts: 91
Loc: SC, USA
Hi all. I race a Honda Prelude dirt circle track car on the weekends. Car has a H22 NA 4 cylinder engine built by me making 210 whp. Engine has a solid DOHC valvetrain with a mile cam and valve springs.

Engine sees anywhere from 8500-9000 rpm twice a lap (at the end of the straights) and runs anywhere from 5 lap heats to 60 lap mains (with cautions). Coolant temp stays around 180-200f. Have been running amsoil dominator 10w-30 with great success but lately am getting tired of $60 oil changes. Is there a suitable off the shelf oil for my application, or should I suck it up and keep running whatís been working?

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#4758754 - 05/16/18 12:25 PM Re: Do I really need racing oil? [Re: Bxnanaz]
1JZ_E46 Online   content


Registered: 04/04/16
Posts: 1311
Loc: Oregon
Have any idea what oil temps you see?
_________________________
2007 BMW X5 4.8i, 108k: M1 10W-30 HM, Mann
2012 Mini Cooper, 48k: Castrol 0W-30, Mann (for sale)
2016 Mini Countryman S ALL4, 20k: Castrol 0W-30, Mann

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#4758757 - 05/16/18 12:28 PM Re: Do I really need racing oil? [Re: 1JZ_E46]
Bxnanaz Offline


Registered: 11/28/17
Posts: 91
Loc: SC, USA
Originally Posted By: 1JZ_E46
Have any idea what oil temps you see?


I unfortunately do not. The car does have a factory oil cooler though.


Edited by Bxnanaz (05/16/18 12:29 PM)

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#4758769 - 05/16/18 12:35 PM Re: Do I really need racing oil? [Re: Bxnanaz]
JustN89 Offline


Registered: 06/27/17
Posts: 512
Loc: DFW
What's the capacity? Is this primarily just a track car or does it see some daily driving?


Personally, I would stick with what has worked. That said, I would think that a good 0W-40 (M1, PUP, etc) would treat your engine well too.

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#4758773 - 05/16/18 12:40 PM Re: Do I really need racing oil? [Re: JustN89]
Bxnanaz Offline


Registered: 11/28/17
Posts: 91
Loc: SC, USA
Originally Posted By: JustN89
What's the capacity? Is this primarily just a track car or does it see some daily driving?


Personally, I would stick with what has worked. That said, I would think that a good 0W-40 (M1, PUP, etc) would treat your engine well too.


This is a track car only. Completely gutted, no windows etc. Car only weighs 2175 with me in it. Just over 5 quart capacity

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#4758783 - 05/16/18 12:47 PM Re: Do I really need racing oil? [Re: Bxnanaz]
Claud Offline


Registered: 02/11/14
Posts: 593
Loc: Margate England
You are taking your engine to its limits, for such extreme use, an oil blended for that purpose would seem a must to me. Because it is made in limited quantities it will cost more than oil for engines used for everyday use.
Maybe you could save a few bucks, but if it leads to premature engine failure it will be a very expensive economy measure.

Claud.

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#4758786 - 05/16/18 12:49 PM Re: Do I really need racing oil? [Re: Bxnanaz]
1JZ_E46 Online   content


Registered: 04/04/16
Posts: 1311
Loc: Oregon
You could try M1 or Castrol 0W-40. Or perhaps a CK-4 5W-40 (Delo, Delvac, Rotella). I wouldnít run any oil with the ILSAC GF-5 specification. Itís really hard to say without oil temps though. Iíd stick with what your running if it were me.

How often do you change the oil?


Edited by 1JZ_E46 (05/16/18 12:56 PM)
_________________________
2007 BMW X5 4.8i, 108k: M1 10W-30 HM, Mann
2012 Mini Cooper, 48k: Castrol 0W-30, Mann (for sale)
2016 Mini Countryman S ALL4, 20k: Castrol 0W-30, Mann

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#4758795 - 05/16/18 12:55 PM Re: Do I really need racing oil? [Re: 1JZ_E46]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4565
Loc: North Carolina
Originally Posted By: 1JZ_E46
You could try M1 or Castrol 0W-40.

+1
_________________________
"Zed's dead baby, Zed's dead."

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#4758817 - 05/16/18 01:15 PM Re: Do I really need racing oil? [Re: 1JZ_E46]
Bxnanaz Offline


Registered: 11/28/17
Posts: 91
Loc: SC, USA
Originally Posted By: 1JZ_E46
You could try M1 or Castrol 0W-40. Or perhaps a CK-4 5W-40 (Delo, Delvac, Rotella). I wouldnít run any oil with the ILSAC GF-5 specification. Itís really hard to say without oil temps though. Iíd stick with what your running if it were me.

How often do you change the oil?


Lately Iíve been changing it every 2-3 races due to some pretty heavy fuel dilution. Need to get a re-tune but itís been hard to line up a date that works for me and the tuner I use.

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#4758822 - 05/16/18 01:22 PM Re: Do I really need racing oil? [Re: Bxnanaz]
burla Offline


Registered: 11/07/16
Posts: 257
Loc: sonoma
On a dirt track? LOL

No need, use what you want.

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#4758827 - 05/16/18 01:25 PM Re: Do I really need racing oil? [Re: burla]
Bxnanaz Offline


Registered: 11/28/17
Posts: 91
Loc: SC, USA
Originally Posted By: burla
On a dirt track? LOL

No need, use what you want.


Huh? Not sure whatís so funny about a dirt track....

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#4758834 - 05/16/18 01:37 PM Re: Do I really need racing oil? [Re: Bxnanaz]
1JZ_E46 Online   content


Registered: 04/04/16
Posts: 1311
Loc: Oregon
Originally Posted By: Bxnanaz
Originally Posted By: burla
On a dirt track? LOL

No need, use what you want.


Huh? Not sure whatís so funny about a dirt track....


Donít mind the trolls.

If your changing oil so often, youíre probably not getting the value out of Amsoil. That oil can go a lot longer in your application (absent fuel dilution).
_________________________
2007 BMW X5 4.8i, 108k: M1 10W-30 HM, Mann
2012 Mini Cooper, 48k: Castrol 0W-30, Mann (for sale)
2016 Mini Countryman S ALL4, 20k: Castrol 0W-30, Mann

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#4758838 - 05/16/18 01:42 PM Re: Do I really need racing oil? [Re: Bxnanaz]
IndyIan Offline


Registered: 09/23/08
Posts: 9150
Loc: Ontario, Canada
I'd assume your oil temps are quite hot and start looking at specs at some of the 15W40 semi-syn diesel oils, or the 5W40 full syn oils. They are cheap and common.
Probably far more trouble than its worth, but I wonder if a few hours in a crock pot (with the lid off)would evaporate most of the fuel?


Edited by IndyIan (05/16/18 01:52 PM)
_________________________
07 Focus ZXW, 5spd manual, 210km M1 5W30
18 Outback 2.5 CVT 10km 0W20 "bulk subaru" whatever that is

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#4758840 - 05/16/18 01:44 PM Re: Do I really need racing oil? [Re: 1JZ_E46]
Bxnanaz Offline


Registered: 11/28/17
Posts: 91
Loc: SC, USA
Originally Posted By: 1JZ_E46
Originally Posted By: Bxnanaz
Originally Posted By: burla
On a dirt track? LOL

No need, use what you want.


Huh? Not sure whatís so funny about a dirt track....


Donít mind the trolls.

If your changing oil so often, youíre probably not getting the value out of Amsoil. That oil can go a lot longer in your application (absent fuel dilution).


Yeah the fuel dilution is whatís making me change it early. I should probably just keep running whatís working and just fix the fuel dilution ASAP.

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#4758846 - 05/16/18 01:47 PM Re: Do I really need racing oil? [Re: Bxnanaz]
1JZ_E46 Online   content


Registered: 04/04/16
Posts: 1311
Loc: Oregon
I think thatís a good idea. What do you think is causing the dilution? Old injectors?
_________________________
2007 BMW X5 4.8i, 108k: M1 10W-30 HM, Mann
2012 Mini Cooper, 48k: Castrol 0W-30, Mann (for sale)
2016 Mini Countryman S ALL4, 20k: Castrol 0W-30, Mann

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