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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Mar-20-2017, 11:35:09 PM   #1
T3AMFiSh
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Default Just rebuilt the motor, need advice on oil for break in

Cant find anything useful on what type of oil to use on initial break in.

Ive just rebuilt the S54, including new main/rod bearings and new rings for the pistons. I know enough to NOT use synthetic on initial break in oil. Also what is the proceedure for this particular engine( run it hard or easy and for how many miles or minutes). Just want to make sure i seat the new piston rings correctly.

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Old Mon, Mar-20-2017, 11:45:17 PM   #2
mrgicm
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Default Re: Just rebuilt the motor, need advice on oil for break in

I have also just rebuilt the engine and have used 15W-40 cheapest NON syntetic mineral oil.

Syntetic oil is too 'slippery' and will not do as a good job on collecting leftovers from the engine.

My plan is to take it very lightly up to 5k rpm and just vary on the rpm as much as possible.

Also will try to do some pulls up to 6th gear and just downshift and let the rpm fall in every gear.
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Old Mon, Mar-20-2017, 11:45:38 PM   #3
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Default Re: Just rebuilt the motor, need advice on oil for break in

I don't know, man. I would stick to the 10w-60 and change it in 1200 miles. BMW put a new long block in my car, and that was what they did. M-Power (Blue bottle) oil since the first mile on the new engine. Been running freaking great.
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Old Mon, Mar-20-2017, 11:55:57 PM   #4
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Default Re: Just rebuilt the motor, need advice on oil for break in

I used Lucas Oil High Zinc 20W-50 Break-In oil.

http://lucasoil.com/products/engine-...e-break-in-oil

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Old Tue, Mar-21-2017, 12:13:02 AM   #5
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Default Re: Just rebuilt the motor, need advice on oil for break in

20-50?? isnt that a lil thick for breaking in rings? just askin
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Old Tue, Mar-21-2017, 01:29:42 AM   #6
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Default Re: Just rebuilt the motor, need advice on oil for break in

I would go w/whatever the piston/ring manufacturer recommends, but I'll also quote myself from a couple of yrs ago...

"Many of today's modern engines (high performance & std. passenger cars) run synthetic oil right from the factory...there is no break-in period done using conventional oil. Modern metal composition of the rings, bearings, etc. coupled w/updated machining techniques of the cylinder walls no longer requires a break-in period. The engines are literally broken in immediately upon initial start up.

But if it makes you feel any better, starting it up and running w/conventional motor oil should be fine. Just remember to change it out before you take the engine to higher rpm's...for the sake of the bearings. GL!"
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Old Tue, Mar-21-2017, 02:23:21 AM   #7
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Default Re: Just rebuilt the motor, need advice on oil for break in

Quote:
Originally Posted by T3AMFiSh View Post
20-50?? isnt that a lil thick for breaking in rings? just askin
Not really if you look at BMW's recommended 10W-60 in the S54 motor.

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Old Tue, Mar-21-2017, 03:28:08 AM   #8
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Default Re: Just rebuilt the motor, need advice on oil for break in

BMW did break-in on spec oil.
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Old Tue, Mar-21-2017, 07:10:51 PM   #9
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Default Re: Just rebuilt the motor, need advice on oil for break in

Quote:
Originally Posted by stash1 View Post
I would go w/whatever the piston/ring manufacturer recommends, but I'll also quote myself from a couple of yrs ago...

"Many of today's modern engines (high performance & std. passenger cars) run synthetic oil right from the factory...there is no break-in period done using conventional oil. Modern metal composition of the rings, bearings, etc. coupled w/updated machining techniques of the cylinder walls no longer requires a break-in period. The engines are literally broken in immediately upon initial start up.

But if it makes you feel any better, starting it up and running w/conventional motor oil should be fine. Just remember to change it out before you take the engine to higher rpm's...for the sake of the bearings. GL!"
That is true if it were from the factory, where a brand NEW head is used, a brand new block etc..

Here where we bore/polish/port the block engine no matter how many times you wash it before there is a chance of some micro debrie being left. Thats why mineral oil is used as its friction is higher and scoops up all the unwanted particles from the engine.
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Old Tue, Mar-21-2017, 08:18:14 PM   #10
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Default Re: Just rebuilt the motor, need advice on oil for break in

As long as you crank the car over without spark until you have oil pressure before the first start, as well as using assembly lube (obviously), I don't see any reason to not use 10w-60. I used normal 10w-60 with an additional zinc break in additive for the first start up, let it idle for a few minutes and drained it. Then put just 10w-60 in, put 200 miles of light driving on it and drained that. Then went another 800 miles of easy driving on that oil and drained it. Then just normal intervals after that.
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Discussing Just rebuilt the motor, need advice on oil for break in in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)