What's a reasonable starting point for fluid change intervals? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

hpde_addict · 09-13-2016, 01:41 PM

What's a reasonable starting point for fluid change intervals, in the number of track days? My car is stock N/A, EHP tires, XP8 / Club Racer, has an oil cooler installed, and "level of abuse" is around 2:16 at Thunderhill Bypass.

Engine - Redline 5W30
Brake/Clutch - Motul RBF600
Transmission/Differential - Motul Gear 300

CSG Mike · 09-13-2016, 02:04 PM

You're using good stuff.

Engine - normal oil change interval, as long as your oil cooler is suffient and keeping your temps under 250F (stock oil temp is read post-cooler, so oil temp peak is higher)

Brake fluid - Whenever the feel degrades, or your reservoir is dark

Clutch fluid - once a year (use leftover brake fluid from a bleed)

Trans/Diff - Every 5 days, or 15k miles, whichever comes first.

MarkR171 · 09-13-2016, 02:25 PM

Quote:

Originally Posted by CSG Mike

Trans/Diff - Every 5 days, or 15k miles, whichever comes first.

Edit: I just realized this is every 5 TRACK days. Makes perfect sense now, move along.

Icecreamtruk · 09-13-2016, 02:29 PM

Emm, so I should have changed my tranny fluids twice already this year, this might explain why my first and second dont want to engage right after a track day (as in, right after when driving home).

CSG Mike · 09-13-2016, 03:47 PM

These are just ballpark recommendations. Adapt them to your useage, habits, and pace.

hpde_addict · 09-13-2016, 04:58 PM

Quote:

Originally Posted by CSG Mike

Engine - normal oil change interval, as long as your oil cooler is suffient and keeping your temps under 250F (stock oil temp is read post-cooler, so oil temp peak is higher)

Would a limit of 10 days per oil change be a good starting point?

BTW, I think these initial guidelines would be very useful for noobs in "Quick and dirty guide to track prepping your car".

CSG Mike · 09-13-2016, 08:11 PM

Quote:

Originally Posted by hpde_addict

Would a limit of 10 days per oil change be a good starting point?

BTW, I think these initial guidelines would be very useful for noobs in "Quick and dirty guide to track prepping your car".

Good idea!

Used oil analysis is the best way to determine intervals...

Insurme1 · 09-15-2016, 01:05 PM

Mike,

I track my car and would love your advise on what oil I should be running. I will purchase from you as well. My car has a Cosworth SC and P&L oil cooler but the oil cooler is not very efficient. My temps are near 300 at the end of my run sessions. Currently running 15w50 Mobile 1 synthetic but it just makes me nervous it's too thick. I'm very aware of the engine failures with our cars and oil temp to be a factor.

Please help!
Thanks,

Mike

CSG Mike · 09-15-2016, 01:54 PM

Quote:

Originally Posted by Insurme1

Mike,

I track my car and would love your advise on what oil I should be running. I will purchase from you as well. My car has a Cosworth SC and P&L oil cooler but the oil cooler is not very efficient. My temps are near 300 at the end of my run sessions. Currently running 15w50 Mobile 1 synthetic but it just makes me nervous it's too thick. I'm very aware of the engine failures with our cars and oil temp to be a factor.

Please help!
Thanks,

Mike

You need to fix that oil temp issue first, but I don't recommend running thicker than a 30 weight on this car.

Running too thick an oil ALSO results in higher temperatures, due to friction. Try a 30 weight first, and then keep an eye on your oil temps, and proceed from there.

Icecreamtruk · 09-15-2016, 01:56 PM

Quote:

Originally Posted by Insurme1

Mike,

I track my car and would love your advise on what oil I should be running. I will purchase from you as well. My car has a Cosworth SC and P&L oil cooler but the oil cooler is not very efficient. My temps are near 300 at the end of my run sessions. Currently running 15w50 Mobile 1 synthetic but it just makes me nervous it's too thick. I'm very aware of the engine failures with our cars and oil temp to be a factor.

Please help!
Thanks,

Mike

Not mike, but from what I have read here I would guess that his first question would be, why are you using 15W50 oil? The car is supposed to use 0W20, ok yeah yours is supercharged, so maybe 5W30 or even 10W40 could make sense, but 15W50 is way too much. Remember the thicker the oil, the more heat it retains and the harder it becomes to cool down.

Insurme1 · 09-15-2016, 02:21 PM

Quote:

Originally Posted by Icecreamtruk

Not mike, but from what I have read here I would guess that his first question would be, why are you using 15W50 oil? The car is supposed to use 0W20, ok yeah yours is supercharged, so maybe 5W30 or even 10W40 could make sense, but 15W50 is way too much. Remember the thicker the oil, the more heat it retains and the harder it becomes to cool down.

Actually from a senior member from this forum. According to his analysis a forced induction motor under extreme summer conditions being tracked the viscosity of the lower weight oil breaks down causing a loss of pressure then failure. I have been somewhat nervous about it that's why I'm asking.

Insurme1 · 09-15-2016, 02:35 PM

Quote:

Originally Posted by CSG Mike

You need to fix that oil temp issue first, but I don't recommend running thicker than a 30 weight on this car.

Running too thick an oil ALSO results in higher temperatures, due to friction. Try a 30 weight first, and then keep an eye on your oil temps, and proceed from there.

Thanks Mike! Going on to your site and purchase some goodies today!

Thanks Mike Shelton

CSG Mike · 09-15-2016, 06:46 PM

Quote:

Originally Posted by Insurme1

Actually from a senior member from this forum. According to his analysis a forced induction motor under extreme summer conditions being tracked the viscosity of the lower weight oil breaks down causing a loss of pressure then failure. I have been somewhat nervous about it that's why I'm asking.

If you use a full synthetic as mandated by Subaru, the oil won't break down. Sometimes, following directions pays off!

mav1178 · 09-15-2016, 08:51 PM

Quote:

Originally Posted by CSG Mike

Trans/Diff - Every 5 days, or 15k miles, whichever comes first.

My UOA analysis really suggests different.

http://www.ft86club.com/forums/showthread.php?p=2452143

09-13-2016, 01:41 PM	#1
hpde_addict Senior Member Join Date: May 2015 Drives: '18 Camaro V6 1LE Location: SF Bay Area Posts: 161 Thanks: 57 Thanked 47 Times in 31 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	What's a reasonable starting point for fluid change intervals? What's a reasonable starting point for fluid change intervals, in the number of track days? My car is stock N/A, EHP tires, XP8 / Club Racer, has an oil cooler installed, and "level of abuse" is around 2:16 at Thunderhill Bypass. Engine - Redline 5W30 Brake/Clutch - Motul RBF600 Transmission/Differential - Motul Gear 300

09-15-2016, 01:05 PM	#8
Insurme1 Member Join Date: Feb 2014 Drives: 2013 Scion FR-S 10-Series Location: Troy, AL Posts: 65 Thanks: 116 Thanked 9 Times in 7 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Recommended Oil Mike, I track my car and would love your advise on what oil I should be running. I will purchase from you as well. My car has a Cosworth SC and P&L oil cooler but the oil cooler is not very efficient. My temps are near 300 at the end of my run sessions. Currently running 15w50 Mobile 1 synthetic but it just makes me nervous it's too thick. I'm very aware of the engine failures with our cars and oil temp to be a factor. Please help! Thanks, Mike

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09-13-2016, 02:04 PM	#2
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,562 Thanks: 8,942 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	You're using good stuff. Engine - normal oil change interval, as long as your oil cooler is suffient and keeping your temps under 250F (stock oil temp is read post-cooler, so oil temp peak is higher) Brake fluid - Whenever the feel degrades, or your reservoir is dark Clutch fluid - once a year (use leftover brake fluid from a bleed) Trans/Diff - Every 5 days, or 15k miles, whichever comes first.

09-13-2016, 02:29 PM	#4
Icecreamtruk Senior Member Join Date: Dec 2015 Drives: Track preped NA FRS Location: Montreal, Canada Posts: 987 Thanks: 1,056 Thanked 681 Times in 405 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	Emm, so I should have changed my tranny fluids twice already this year, this might explain why my first and second dont want to engage right after a track day (as in, right after when driving home).

09-13-2016, 03:47 PM	#5
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,562 Thanks: 8,942 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	These are just ballpark recommendations. Adapt them to your useage, habits, and pace.

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