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#1 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
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What oil to use when starting a fresh motor?
What is the best oil, weight, etc. to use to break in a newly rebuilt engine? Any suggestions are appreciated.
Thanks. |
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#2 |
Got Light Emitting Diode?
Join Date: Apr 2004
Location: Newberg, OR
Posts: 2,485
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i used castrol gtx 10-40
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's ![]() 1993 Cherokee work ride/weekend wheeler |
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#3 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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As long as it is detergent, and non-synthetic.
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#4 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
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I thought I remembered someone saying a straight weight is best for breakin, but wasn't sure.
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#5 |
Registered User
Join Date: Mar 2004
Location: Lexington, KY
Posts: 865
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I always use 30W for the first hour, then swap to 10/40. I do this just to clean the engine out.
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#6 |
Account Suspended
Join Date: Dec 2003
Location: Texas
Posts: 2,686
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I put 6 quarts of valoline 10W40 in mine and change it out at 500 miles then 3000 from then on.
I only overfill the engine by a quart the first time for break in. |
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#7 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,285
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I'm breaking in my new 292 with 6 quarts of Napa straight 30 SAE non-detergent for the first 100 miles, then switching to detergent 30 weight. I will also add the 8 oz bottle of GM break-in oil (EOS).
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#8 | |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Quote:
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#9 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,699
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Gm's EOS (engine oil suppliment) with your normal weight oil.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#10 |
67 is sold
Join Date: Apr 2001
Location: Troy, Michigan
Posts: 6,738
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I've heard it is best to use dino oil on a new engine, but then again the Corvette and exotics use Mobil 1 from the start with no issues
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#11 | |
Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
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Quote:
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA |
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#12 |
A classic GM kinda guy
Join Date: Mar 2004
Location: Phoenix, Arizona
Posts: 296
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Valvoline 30 wt with GM Engine oil supplement for the first 50 miles/50 minutes. 30 wt Valvoline, changed again @500 miles, 1500, then every 2000 to 3000 miles thereafter. One engine I have done this to just ticked over 150,000 since the rebuild. Can't complain about that.
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Old school rap music: a dual exhausted GM 6 with no mufflers. "If you can find a better vehicle, buy it" Lee Iacocca, Chrysler commercials of the '80s. "I did. They are called Classic GM pickups !!!" ![]() ![]() |
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#13 |
PROJECT 7DEUCE
![]() Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,608
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10 W 30 Valvoline Never Had A Failure Yet???
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GO BIG GREEN ![]() MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
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#14 |
Merciless Butcher
Join Date: Oct 2003
Location: CC Nevada
Posts: 1,447
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Is there much value in using the GM EOS ? I have purchased several GM crate motors in the past and have been forced to purchase it when I purchase the crate motor by the GM parts guy. He says you won't get the warranty if you don't buy it. I have always dumped it in with the oil during the break in period. Just wondering??
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Your Bought And Sold....I Got Your Soul! |
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#15 |
Registered User
Join Date: Mar 2003
Location: Columbus Ohio
Posts: 1,413
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Never use a ND oil in a modern engine. They don't generally have the anti-wear and anti corrosion additives necessary to fully protect your engine. GM's EOS is loaded with anti wear agents, which may offset this to some extent........but there is just no reason to use a ND oil. Some very old engines with rope seals are not compatible with detergent oils, but these engines are few are far between.
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