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Break-in oil for rebuilt motor

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Old 05-24-2009, 03:48 PM
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Default Break-in oil for rebuilt motor

HP500 carb stock rebuild. Anybody have problem with rings seating using 15w 50 silver cap Mobile 1? Or am I better off breaking in motors with something else and then start using mobil 1?

Thanks, Morry
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Old 05-24-2009, 04:44 PM
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dont use synthetic, it will not break in. Save your money
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Old 05-24-2009, 05:54 PM
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valvoline 50w racing has one of the highest zinc contents. straight weight has few additives. i always do a leak-down prior and post break-in.
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Old 05-24-2009, 08:51 PM
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In the last X # of years this thread has gone round and round and round and round and round and... Some say that synthetic is too slippery to use as break-in oil. Others give some snake-oil concept of using something like canola oil and boiled linseed oil with crisco.

Seriously...you will be fine with any name brand oil as long as it is the correct viscosity and it's changed frequently. More importantly is probably which filter to use. Do a search and you'll find lots of great information.

For questions on oil specifics, contact Hydrocruiser...he's the man with the scientific knowledge!

*FYI--don't use the above-mentioned trick. Chances are if you use that combination in the engine as well as the bottom of your boat you'll gain 4-7mph.
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Old 05-24-2009, 09:41 PM
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Originally Posted by harsin View Post
HP500 carb stock rebuild. Anybody have problem with rings seating using 15w 50 silver cap Mobile 1? Or am I better off breaking in motors with something else and then start using mobil 1?

Thanks, Morry
You should never use a synthetic to break in anything. Film strengths are too high, therefore not allowing components to seat properly.

Just use a petroleum based oil for minimum duration. i.e. 10 hours. Then switch to a synthetic.
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Old 05-25-2009, 06:13 AM
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I just rebuilt a pair of 575 SCi's this winter. As per the advise of a well known peson here on OSO, I used Joe Gibbs break in oil. Looks like quality oil.

http://www.saferacer.com/joe-gibbs-r...?productid=425
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Old 05-25-2009, 12:51 PM
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never use synthetic on break-in. Us a conventional oil and add some crane break-in lube to it. Also, whichever company you bought your rings from, ask what they recommend.
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Old 05-25-2009, 09:08 PM
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At Raylar Engine we like to use Shell Rotella 15-40W for breakins, got a great zinc and additive ashless wear package and after breakin you can switch to synthetics. I also like the gallon bottles, pouring 10 quarts from quart bottles just sucks!

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Ray @ Raylar
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Old 05-26-2009, 09:46 AM
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Ray , how long do you leave the Rotella in for ? how many hours ? thanks Tim
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Old 05-26-2009, 10:29 AM
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Quote:
Originally Posted by Raylar View Post
At Raylar Engine we like to use Shell Rotella 15-40W for breakins, got a great zinc and additive ashless wear package and after breakin you can switch to synthetics. I also like the gallon bottles, pouring 10 quarts from quart bottles just sucks!

Best Regards,
Ray @ Raylar
My engine builder suggested the same thing - Shell Rotella - changed at 10hrs - been running like a champ ever since.

We DID break the cams in at 1600 RPM for 40 minutes as well.....
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