Anybody have opinions as to the type/kind of break-in substance for a re-build. Joe Gibbs oil is what I have.  Do I use 5 qts of this or 1 and add 4 other qts of quality oil? Is the additive in pints better? I am told as long as the ZINK and PHOSPHEROUS is in there thata all I need for break-in. I am also told that ROTELLA DIESEL oil has all content of chemicals needed. Can I mix the Gibbs oil with Rotella with out a problem?    THANKS  Mark

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My brother's shop typically breaks in their engines with diesel oil. Never blowd one up yet!!

Those oils should mix just fine. I believe all oils are reasonably compatible but, they used to warn against mixing synthetics with conventional oils, but I don't believe that's even a problem anymore. "I'M NO EXPERT". I've always used my own recipe of oils and additives and after 20 yrs. my motors still hardly use oil. In fact I've never retired a vehicle because the motor was worn out. Usually the electronics begin to act up and I can't diagnose relays, senders and computer stuff so I give up on the car.

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Jimmy B.
Just can't wait to get on the road again.

 
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Alot of people used to use diesel oil because of the zink phospherous additive but the mfg's removed it, also diesel oil doesn't have high rpm additives because diesels don't turn high rpm, all regular motor oils has had the zink- phos. removed because most new motors have roller cams  and don't need the high pressure  additive of zink, also zink gums up the oxy sensor's, for a flat tappet new motor break in I recomend a good 30 W detergent motor oil with a can of GM engine Oil Suppliment Pt#1052367, for the run in, if you have a high cap. pan add two bottles of EOS, change the oil after a couple hundred miles and add a bottle or two of "ZDDPlus" zink-phos. additive one bottle treats 5 Qt's, synthetic motor oil is NOT a good break in oil, its too slick of an oil it runs off the parts too fast for break in, after break in  its ok.  anips2010-03-09 09:40:53

I agree with "anips" on everything except for one thing. I'd use 10W30 oil. It's just my opinion but it will reach the smaller crevis's more thoroughly for the break-in period. Good luck with it, and by the way, your pic of your Vette looks great. I really like that color combo.

10-30 is good

   MANY   THANKS  to  ALL who added thoughts.    Mark

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My "Thoughts" are thinking of better weather !!!!!!

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I only use Rotella T in my rebuild, it has the minerals for the old small block, zinc & phosphorus.  Don't believe what you read on the internet.

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MICK - C3VR Lifetime Member #113

Didn't read it on the internet, saw it in Hot Rod and other auto publications, if it works for you , great, but because big rigs are soon to be smogged  and have to run oxy sensors like gas  engines Rotella probabley will not have it for long, Zink Phos ruin the sensors after  a while, and because diesel oil doesn't have anti forming agents for high RPM operation acording to publications  can cause oil pump cavitation which can starve the motor for oil at rpm. 

Maybe Bob the oil guy's link will help to shed some light on the subject.

For the record I use Rotella..... at least for now. If it goes belly up then it will be 10w40 valvoline and Lucas Oil or Red Line additives.

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Tuxblacray: She's Back In Black! Check out my pics @ My Link


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[QUOTE=anips]Didn't read it on the internet, saw it in Hot Rod and other auto publications, if it works for you , great, but because big rigs are soon to be smogged  and have to run oxy sensors like gas  engines Rotella probabley will not have it for long, Zink Phos ruin the sensors after  a while, and because diesel oil doesn't have anti forming agents for high RPM operation acording to publications  can cause oil pump cavitation which can starve the motor for oil at rpm. [/QUOTE] I don't race my car.  I drive it normally and I keep my foot out of her (I don't want a ticket & I don't want to tear it up).  I'll keep the Rotella T with the meat sauce..........

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MICK - C3VR Lifetime Member #113

I drive my car like the classic it is to, but for those who like to wring the motor out it could cause a problem, when people are comfortable with what they do and theres nothing wrong with that, its sometimes hard to convince them otherwise, take me for instance, for years I've been useing cloths soap in my dish washer, I find that my paper plates come out with less wrinkles and they smell good to.................. anips2010-03-14 09:31:14