5-30 or 10-30 for breakin ??

IllNastyImpreza · 09-17-2007, 02:06 PM

ok so I've been doin a little bit of reasearch for the best way to break in my motor. I will be running NA for the first 1,000-1500 miles to get the rings to seat the best they can.

I have not decided which breakin method to go with yet though...

A: Balls to the wall ( get the rings to WEAR ! )

b: take her easy... (it will all happen eventualy, and is easier on her....? )

BUT I have not been able to find the best oil to use...

I picked up some Penzoil 10-30 cuz it was on sale,

I plan on filler her up....startin her up and fixing any leaks or whatnot...then changing the oil. Then again after 100 miles, then again after 500,1000,1500 and then return to normal 3k miles...

BUT is it a bad thing to change brands/oil weight once I have picked one??

I have also heard Rotella-T is the best to use... whata u guys think ??

eventually I will be swithing over to full Mobil 1 synthetic....

* Registered users of the site do not see these ads.

flycaster · 09-17-2007, 02:31 PM

Why not ask Jeremy - he built the motor, no?

pentaxis · 09-17-2007, 07:18 PM

I have a built MR2 that I did a hard break-in on. Everything sealed perfectly. I used super cheap 10-40 penzoil dino oil for break-in.

dingobite · 09-18-2007, 12:27 AM

I just went through this issue myself at 7000 miles on CP pistons regular 2.0L even drained all the synthetic and threw in back in the motor to be sure theres no oil loss so far 1900 miles past the 5,600 mile mark and it looks good i do kinda go into boost alot.

Started out with 10w30 for just under 300 miles went to Rotella 15w40 for nearly 2500 miles then was tuned at 5k miles on a mix of pennz 10w30 and one quart of 10w40 all Dyno oil.
I stayed under 5000 rpms as much as i could for the breakin i did hit 128mph in 5th gear at 273 miles once.

dmross · 09-18-2007, 02:43 PM

I ran some cheap-o 5w-30 for the first 50 miles, then switched to Rotella T 15w-40, as recommended by Ron @ Axis. Currently at 600 miles and regularly pushing 5-10psi up to 6000RPM.

IllNastyImpreza · 09-25-2007, 11:17 AM

cool some good info here...

I think I'll use my cheapo penzoil 10 30 initialy, then again till 100 miles...then switch over to that Rotella T 15-40

jays05 · 09-25-2007, 11:52 AM

I am gonna stick with rotella-t 15w40 on the next motor. But I may try an SAE 30wt oil for the initial startup and first couple miles (as per Cobb guidelines).

thunder_sti · 09-25-2007, 06:30 PM

How many hours/miles break in period?

The break-in period is for the rings. The generally recommended break-in period is 1000 miles.

Synthetic or regular oil?

Regular for the duration of the break-in period, then the owner is free to use any type they desire.

First oil change should be performed after how many hours/miles?

After 1000 miles and before the dyno tune.

Oil weight for before and after break in period?

5W-30

More frequent oil changes with new pistons?

Other than the break-in period, no.

More info:

http://forums.nasioc.com/forums/showthread.php?t=907570

IllNastyImpreza · 09-25-2007, 07:48 PM

Quote:

Originally Posted by thunder_sti

How many hours/miles break in period?

The break-in period is for the rings. The generally recommended break-in period is 1000 miles.

Synthetic or regular oil?

Regular for the duration of the break-in period, then the owner is free to use any type they desire.

First oil change should be performed after how many hours/miles?

After 1000 miles and before the dyno tune.

Oil weight for before and after break in period?

5W-30

More frequent oil changes with new pistons?

Other than the break-in period, no.

More info:

http://forums.nasioc.com/forums/showthread.php?t=907570

why 5-30 ??

Master2192 · 09-25-2007, 08:09 PM

shooting into the breeze, but I think it would be because 5w-30 has a bit less shear protection allowing the piston rings to seal better against the cylinder walls which is what break-in is all about.

Jeremy@Cobb · 09-27-2007, 06:03 PM

Quote:

Originally Posted by flycaster

Why not ask Jeremy - he built the motor, no?

No this engine was not build by Cobb, this was an older Original series Cobb closed deck bought used.
Another machine shop now did the machine work, installed sleeves, and built the engine.

- J.

IllNastyImpreza · 09-27-2007, 06:50 PM

Quote:

Originally Posted by Jeremy@Cobb

No this engine was not build by Cobb, this was an older Original series Cobb closed deck bought used.
Another machine shop now did the machine work, installed sleeves, and built the engine.

- J.

so what oil do ya recomend for breakin ??

flycaster · 09-27-2007, 08:52 PM

Quote:

Originally Posted by Jeremy@Cobb

...Another machine shop now did the machine work, installed sleeves, and built the engine...

Ah, gotcha.

Nasty, quit stressing about this, put some decent non-synthetic oil in it, change it a few times, lay off high boost but give it some rev rolls, and break the darned thing in. At some point, you either have faith the builder put together a nice, tight motor...or you don't. Either way, get 'er done.

The only thing that ever concerns me is using the proper weight - and only the builder can answer that because only he knows what bearing tolerances he set. Ask him, then get on with it and go have some fun.

Jeremy@Cobb · 09-28-2007, 01:46 PM

Quote:

Originally Posted by IllNastyImpreza

so what oil do ya recomend for breakin ??

Like I said in my email to you.
I would suggest to use 10/30 valvoline non-synthetic.

During break in, you change your oil well before the oil has a chance to break down. This is why the exact choice of oil (like Fly mentioned) is not as important.

- J.

IllNastyImpreza · 09-28-2007, 03:47 PM

good stuff...

Can't wait to get the thing running.

thanks for the info guys

flycaster · 09-28-2007, 04:23 PM

Have fun, amigo - we want reports.

subaru5614 · 10-01-2007, 08:42 PM

just went through this issue myself at 7000 miles on CP pistons regular 2.0L even drained all the synthetic and threw in back in the motor to be sure theres no oil loss so far 1900 miles past the 5,600 mile mark and it looks good i do kinda go into boost alot.

Started out with 10w30 for just under 300 miles went to Rotella 15w40 for nearly 2500 miles then was tuned at 5k miles on a mix of pennz 10w30 and one quart of 10w40 all Dyno oil.
I stayed under 5000 rpms as much as i could for the breakin i did hit 128mph in 5th gear at 273 miles once.

09-17-2007, 02:06 PM	#1
IllNastyImpreza Scooby Guru Member#: 36333 Join Date: May 2003 Chapter/Region: NESIC Location: East Kingston NH Vehicle: 98 RS GT30R, closed deck madnes	5-30 or 10-30 for breakin ?? ok so I've been doin a little bit of reasearch for the best way to break in my motor. I will be running NA for the first 1,000-1500 miles to get the rings to seat the best they can. I have not decided which breakin method to go with yet though... A: Balls to the wall ( get the rings to WEAR ! ) b: take her easy... (it will all happen eventualy, and is easier on her....? ) BUT I have not been able to find the best oil to use... I picked up some Penzoil 10-30 cuz it was on sale, I plan on filler her up....startin her up and fixing any leaks or whatnot...then changing the oil. Then again after 100 miles, then again after 500,1000,1500 and then return to normal 3k miles... BUT is it a bad thing to change brands/oil weight once I have picked one?? I have also heard Rotella-T is the best to use... whata u guys think ?? eventually I will be swithing over to full Mobil 1 synthetic.... * Registered users of the site do not see these ads.

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09-17-2007, 02:31 PM	#2
flycaster Scooby Specialist Member#: 60142 Join Date: Apr 2004 Location: Bend, OR Vehicle: 2011 WRX Grey	Why not ask Jeremy - he built the motor, no?

09-17-2007, 07:18 PM	#3
pentaxis Scooby Newbie Member#: 82471 Join Date: Mar 2005 Location: Portland, OR	I have a built MR2 that I did a hard break-in on. Everything sealed perfectly. I used super cheap 10-40 penzoil dino oil for break-in.

09-18-2007, 12:27 AM	#4
dingobite Scooby Specialist Member#: 82391 Join Date: Mar 2005 Chapter/Region: MWSOC Location: Lou. ky Vehicle: 08 OBP Sti	I just went through this issue myself at 7000 miles on CP pistons regular 2.0L even drained all the synthetic and threw in back in the motor to be sure theres no oil loss so far 1900 miles past the 5,600 mile mark and it looks good i do kinda go into boost alot. Started out with 10w30 for just under 300 miles went to Rotella 15w40 for nearly 2500 miles then was tuned at 5k miles on a mix of pennz 10w30 and one quart of 10w40 all Dyno oil. I stayed under 5000 rpms as much as i could for the breakin i did hit 128mph in 5th gear at 273 miles once.

09-18-2007, 02:43 PM	#5
dmross Scooby Specialist Member#: 2818 Join Date: Nov 2000 Chapter/Region: MAIC Location: Pittsburgh, PA Vehicle: 2000 2.5RS	I ran some cheap-o 5w-30 for the first 50 miles, then switched to Rotella T 15w-40, as recommended by Ron @ Axis. Currently at 600 miles and regularly pushing 5-10psi up to 6000RPM.

09-25-2007, 11:17 AM	#6
IllNastyImpreza Scooby Guru Member#: 36333 Join Date: May 2003 Chapter/Region: NESIC Location: East Kingston NH Vehicle: 98 RS GT30R, closed deck madnes	cool some good info here... I think I'll use my cheapo penzoil 10 30 initialy, then again till 100 miles...then switch over to that Rotella T 15-40

09-25-2007, 11:52 AM	#7
jays05 Scooby Specialist Member#: 78165 Join Date: Dec 2004 Chapter/Region: South East Location: SC Vehicle: 05 STI 35r + e85	I am gonna stick with rotella-t 15w40 on the next motor. But I may try an SAE 30wt oil for the initial startup and first couple miles (as per Cobb guidelines).

09-25-2007, 06:30 PM	#8
thunder_sti * Banned * Member#: 68315 Join Date: Aug 2004 Location: P.R. 10 SEC CLUB Vehicle: 04 Stock internals 520awhp-C16 425awhp-93o	How many hours/miles break in period? The break-in period is for the rings. The generally recommended break-in period is 1000 miles. Synthetic or regular oil? Regular for the duration of the break-in period, then the owner is free to use any type they desire. First oil change should be performed after how many hours/miles? After 1000 miles and before the dyno tune. Oil weight for before and after break in period? 5W-30 More frequent oil changes with new pistons? Other than the break-in period, no. More info: http://forums.nasioc.com/forums/showthread.php?t=907570

09-25-2007, 08:09 PM	#10
Master2192 RIP 10/12/83 to 02/10/08 Scooby Specialist Member#: 83254 Join Date: Mar 2005 Chapter/Region: NWIC Location: Roy, Washington Vehicle: 98 2.5 RS 04 WRX	shooting into the breeze, but I think it would be because 5w-30 has a bit less shear protection allowing the piston rings to seal better against the cylinder walls which is what break-in is all about.

09-28-2007, 03:47 PM	#15
IllNastyImpreza Scooby Guru Member#: 36333 Join Date: May 2003 Chapter/Region: NESIC Location: East Kingston NH Vehicle: 98 RS GT30R, closed deck madnes	good stuff... Can't wait to get the thing running. thanks for the info guys

09-28-2007, 04:23 PM	#16
flycaster Scooby Specialist Member#: 60142 Join Date: Apr 2004 Location: Bend, OR Vehicle: 2011 WRX Grey	Have fun, amigo - we want reports.

10-01-2007, 08:42 PM	#17
subaru5614 Scooby Newbie Member#: 159072 Join Date: Sep 2007	just went through this issue myself at 7000 miles on CP pistons regular 2.0L even drained all the synthetic and threw in back in the motor to be sure theres no oil loss so far 1900 miles past the 5,600 mile mark and it looks good i do kinda go into boost alot. Started out with 10w30 for just under 300 miles went to Rotella 15w40 for nearly 2500 miles then was tuned at 5k miles on a mix of pennz 10w30 and one quart of 10w40 all Dyno oil. I stayed under 5000 rpms as much as i could for the breakin i did hit 128mph in 5th gear at 273 miles once.