Breakin Oil
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Freshman User
Joined: Feb 2001
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From: Anderson, SC.
Breakin Oil
Just finished building .080 over 292, new CompCam, 57 312 heads and manifold with edelbrock 600 cfm 4bbl. I put it on my run-in stand to break in engine, cam etc. and do final adjustment on valves using synthetic oil. I've put about 2 hrs on engine. Runs good, no smoke. Now I've just read a post on another site that says synthetic won't let rings seat properly and that one should use only straight 30 wt HD oil for break in purposes. Any truth to this? Your thoughts please. Carl
Senior User
Joined: Apr 2002
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From: On the farm near Loveland
Breakin Oil
That's an old wive's tale and the "straight 30 weight for break in" advice has been passed around for the last 50 years at least. It probably never was completely true and it certainly isn't true now. Modern 10W-30 is probably your best choice for break-in, in the winter I wouldn't consider using straight 30 in ANY engine, let alone a tight new one.
Go to the Mobil1 web site and read their FAQs. They say you can use synthetic right away on a new engine.
I've used Mobil 1 in two trucks I bought new, an '87 and a 2002 F-250 PSD. Changed to synthetic at about 500 miles on both of them. I kept the '87 15 years until last year, never had any issues or oil consumption after 175,000 miles, my PSD has about 8,000 on it now and doesn't use or leak any oil, either.
Heck, I'd think you'd WANT a better flowing, less-thickening synthetic in a tight new motor.
If anyone has ever damaged a new engine by using synthetic oil in it, now's the time to speak up!
You'll be fine. Don't sweat it. The biggest issue is you're going to want to change that oil after a few short miles on a new engine and it's a waste of money to throw away a synthetic in such short a time.
Go to the Mobil1 web site and read their FAQs. They say you can use synthetic right away on a new engine.
I've used Mobil 1 in two trucks I bought new, an '87 and a 2002 F-250 PSD. Changed to synthetic at about 500 miles on both of them. I kept the '87 15 years until last year, never had any issues or oil consumption after 175,000 miles, my PSD has about 8,000 on it now and doesn't use or leak any oil, either.
Heck, I'd think you'd WANT a better flowing, less-thickening synthetic in a tight new motor.
If anyone has ever damaged a new engine by using synthetic oil in it, now's the time to speak up!
You'll be fine. Don't sweat it. The biggest issue is you're going to want to change that oil after a few short miles on a new engine and it's a waste of money to throw away a synthetic in such short a time.
Posting Guru
Joined: Feb 2001
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Breakin Oil
Depends on the type of rings you have. Safest thing is not to use synthetic as a breakin oil on a freshly rebuilt engine. A good conventional oil is best.
Originally posted by lrac
Now I've just read a post on another site that says synthetic won't let rings seat properly and that one should use only straight 30 wt HD oil for break in purposes. Any truth to this? Your thoughts please. Carl
Now I've just read a post on another site that says synthetic won't let rings seat properly and that one should use only straight 30 wt HD oil for break in purposes. Any truth to this? Your thoughts please. Carl
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Joined: Nov 2002
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Breakin Oil
From Royal Purple's website:
To allow for proper breakin of the engine, Royal Purple® recommends waiting until the manufacturer's first scheduled oil change or a minimum of 2,000 miles in new gasoline engines. Allow 8,000 to 10,000 miles before using Royal Purple® in diesel engines.
To allow for proper breakin of the engine, Royal Purple® recommends waiting until the manufacturer's first scheduled oil change or a minimum of 2,000 miles in new gasoline engines. Allow 8,000 to 10,000 miles before using Royal Purple® in diesel engines.
Post Fiend
Joined: Jun 2001
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From: Running Springs CA
Breakin Oil
Originally posted by greenpus
Depends on the type of rings you have. Safest thing is not to use synthetic as a breakin oil on a freshly rebuilt engine. A good conventional oil is best.
Depends on the type of rings you have. Safest thing is not to use synthetic as a breakin oil on a freshly rebuilt engine. A good conventional oil is best.
Continental and Lycoming aircraft engines still use chrome plated cylinder bores. They require non-detergent straight mineral oil, usually SAE 50, changed after 25 operating hours. Those engines are based on pre-WWII technology.
Jim
