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Run-in oil #5386280 03/26/20 02:12 PM
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wings&wheels Offline OP
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What are folks using for run-in oil these days?

Aside from new cars, which are a different situation, I haven't run in a new auto engine myself in ~30 years. I see many of the boutique manufacturers are offering them, and I expect my engine builder will recommend one but I like to get a wide pool of opinions. Engine is a 2.0L SOHC I4 M10 engine from a '74 BMW 2002. Eventually she will get my go-to oil for my Summer only vintage cars; M1 15w-50.

Thanks.


'05 Lotus Elise S/C
'85 Land Rover 90 diesel
'74 Triumph TR6
'74 BMW 2002
'72 Land Rover Series III 88"
'99 Porsche 996 (Wife's)
'01 Porsche Boxster S (mostly Wife's...)
Piper Pa28-236


Re: Run-in oil [Re: wings&wheels] #5386294 03/26/20 02:41 PM
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SeaJay Offline
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I'm not a true bitoger, I use the oil the car came with for the first 6 or 7 thousand miles.

Re: Run-in oil [Re: SeaJay] #5386296 03/26/20 02:43 PM
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wings&wheels Offline OP
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Originally Posted by SeaJay
I'm not a true bitoger, I use the oil the car came with for the first 6 or 7 thousand miles.


I do to with new cars usually, but this is an engine I am having rebuilt.


'05 Lotus Elise S/C
'85 Land Rover 90 diesel
'74 Triumph TR6
'74 BMW 2002
'72 Land Rover Series III 88"
'99 Porsche 996 (Wife's)
'01 Porsche Boxster S (mostly Wife's...)
Piper Pa28-236


Re: Run-in oil [Re: wings&wheels] #5386306 03/26/20 02:53 PM
Joined: Jul 2002
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MCompact Offline
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In the mid-nineties before BMW switched to synthetic oils it was recommended not to run synthetic for a bit over 5k miles. I suspect that may be the case for your M10. My OM for my 318ti recommended okayed 15W-50 down to 0F, although I now run BMW TPT 5W-30 as it is no longer a track toy.


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i M Sport


Son's
2009 328i

Buy what makes you smile...
Re: Run-in oil [Re: wings&wheels] #5386307 03/26/20 02:54 PM
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ragtoplvr Offline
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You are before the roller cam era so I would use a 10W40 conventional motorcycle oil for break in or valvoline racing oil in 10w40 after break in, then a 20W50 mtorcycle oil will work well.
They know motorcycle will sit around a lot, and most Harleys still use cast iron bores so they have good corrosion and rust prevention.

Rod

Re: Run-in oil [Re: ragtoplvr] #5386350 03/26/20 04:31 PM
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wings&wheels Offline OP
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Originally Posted by ragtoplvr
You are before the roller cam era so I would use a 10W40 conventional motorcycle oil for break in or valvoline racing oil in 10w40 after break in, then a 20W50 mtorcycle oil will work well.
They know motorcycle will sit around a lot, and most Harleys still use cast iron bores so they have good corrosion and rust prevention.

Rod


Thanks. I do run one of my very limited use cars on M1 20w-50 for those reasons, and it is a recommended weight. I may look towards a non-synth MC oil for this.

MCompact, thanks. I used to run Castrol 5w-50 (before the Castrol vs. Mobil what is 'synth' issue) in my 318ti...miss that car.


'05 Lotus Elise S/C
'85 Land Rover 90 diesel
'74 Triumph TR6
'74 BMW 2002
'72 Land Rover Series III 88"
'99 Porsche 996 (Wife's)
'01 Porsche Boxster S (mostly Wife's...)
Piper Pa28-236


Re: Run-in oil [Re: wings&wheels] #5386409 03/26/20 05:36 PM
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Oildudeny Offline
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0w20 usually NAPA full synthetic with OE filter 6 month oci's

Re: Run-in oil [Re: wings&wheels] #5386411 03/26/20 05:37 PM
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Trav Offline
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ASE L1, Master. Deutsch Meisterbrief.
Re: Run-in oil [Re: Trav] #5386438 03/26/20 06:04 PM
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wings&wheels Offline OP
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Originally Posted by Trav


Thanks!

"..up to 400 miles on the street", interesting.


'05 Lotus Elise S/C
'85 Land Rover 90 diesel
'74 Triumph TR6
'74 BMW 2002
'72 Land Rover Series III 88"
'99 Porsche 996 (Wife's)
'01 Porsche Boxster S (mostly Wife's...)
Piper Pa28-236


Re: Run-in oil [Re: wings&wheels] #5386792 03/27/20 07:24 AM
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Trav Offline
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Probably not the best thing for a cat for much longer than that especially with a rebuilt engine that tend to use a little oil initially.


ASE L1, Master. Deutsch Meisterbrief.
Re: Run-in oil [Re: Trav] #5386895 03/27/20 09:31 AM
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wings&wheels Offline OP
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Originally Posted by Trav
Probably not the best thing for a cat for much longer than that especially with a rebuilt engine that tend to use a little oil initially.

That is what I figured. No cat here so no problem. Thank you again.


'05 Lotus Elise S/C
'85 Land Rover 90 diesel
'74 Triumph TR6
'74 BMW 2002
'72 Land Rover Series III 88"
'99 Porsche 996 (Wife's)
'01 Porsche Boxster S (mostly Wife's...)
Piper Pa28-236


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