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Mod | | | Forums66 Topics128,077 Posts1,055,932 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Feb 2004 Posts: 29,778 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,778 | "Break-In Oil" should probably be sold by somebody named Barnum. I'd suggest Diesel-rated 15W-40 with a little ZDDP additive for the initial 20 minute 2000 RPM run-in to establish the cam/lifter relationship, followed by 10 accelerations from 30-50 MPH in high gear to seat the piston rings. The engine is now officially "broken in". You can either waste the original oil fill, or run it until it's time for the first routine oil change. I'm not a fan of 10W-30 oil in a stovebolt at anytime.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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