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Diesel oil for break in?

Started by I'm a Red Motor fiend , Jan 21 2016 05:28 PM

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36 replies to this topic

#1 I'm a Red Motor fiend

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Posted 21 January 2016 - 05:28 PM

Does anyone here use diesel oil to break in their fresh motors? If so, what brand and grade are you using and how long are you leaving it in for?

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#2 _Bluejinx202_

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Posted 21 January 2016 - 06:13 PM

The dynotuner used diesel oil to run my engine in.. All I remember was is that it was penrite. When it came off the Dyno it was changed. He told me it was mainly to run in cam

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#3 _Bomber Watson_

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Posted 21 January 2016 - 06:32 PM

Im a fan of diesel oils, RX super and similar.

About the right viscosity for a proper Holden engine with the correct firing order (see my avatar), high in zinc, only thing I dont like is the detergents......

I still wanna run RX Super full stop in the new engine for my LJ, but have a few niggling devils on my shoulders telling me to run gay penrite... Havnt made my mind up yet.

Ski boat will be getting RX super from the next oil change, thats for sure.

Not so sure about run in though, probably nothing wrong with it, not sure how the detergents will go with moly lube though?

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#4 _Bluejinx202_

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Posted 21 January 2016 - 06:51 PM

What do the detergents do?

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#5 neglectedtorana

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Posted 21 January 2016 - 06:55 PM

Penrite make a run in oil, might be worth considering

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#6 _Bomber Watson_

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Posted 21 January 2016 - 07:03 PM

What do the detergents do?

Diesel engines get a lot of carbon build up. The detergents remove these. So use with caution on a used engine.

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#7 _Bluejinx202_

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Posted 21 January 2016 - 07:05 PM

So if you used it from the beginning of a fresh engine it would be a good thing?

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#8 _Bomber Watson_

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Posted 21 January 2016 - 07:10 PM

Thats what im thinking.

Have used it from the beginning on engines previously, pulled them down and not a trace of carbon buildup anywhere.

Toyota currently uses the same oil for there petol and diesel engines, this oil is no good to us as it has no zink as there all OHC engines, but still, gotta tell ya something.

Cheers.

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#9 _Bluejinx202_

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Posted 21 January 2016 - 07:25 PM

I was chatting to an old ski racer/engine builder on the side of the Murray couple of weekends ago and he repeated a few times "must use good oil, a good detergent oil" I don't know much about oil so I just nodded and smiled like I knew what he was on about

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#10 _Bomber Watson_

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Posted 21 January 2016 - 08:08 PM

Yeah he would have been talking about a diesel oil I would think.

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#11 _oldjohnno_

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Posted 21 January 2016 - 08:44 PM

Penrite can go frOck themselves. Mixed fleet oils have been doing the job for me for 35+ years so I'll keep using them. But really, I think damn near any remotely appropriate oil will work just fine. There's no need to use anything special for run-in either; you can run the same stuff right from the start.

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#12 _LS1 Taxi_

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Posted 21 January 2016 - 08:56 PM

+1

Run in oils is bollucks.

Good stuff from the start...and every change thereafter.

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#13 _Agent 34_

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Posted 22 January 2016 - 04:57 PM

Just about to run in the new motor (no new cam ) only rings and bearings .

Using penn green break in oil . Three cents.

30 weight with zinc .

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#14 Rockoz

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Posted 23 January 2016 - 10:00 AM

Be wary of using diesel oils in old motors.

Did it by mistake years ago.

Only ever bothered changing filters after that little mistake.

Oil was always fresh.

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#15 I'm a Red Motor fiend

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Posted 24 January 2016 - 05:51 AM

Ok, so a little bit of mixed feedback. Reason I ask is I just freshened up old faithful with a hone, rings and bearings. A very reputable engine builder I was speaking with told me to run diesel oil to bed the rings. After that, drop it and run my normal oil or continue running the diesel. Just wanted to get some feedback I guess for peace of mind as the research I did I found some people refering to the detergents in them as though they were the tool of the devil.

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#16 Rockoz

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Posted 24 January 2016 - 08:10 AM

My research after my episode found that using diesel oil in a motor from fresh wont be an issue.

However if you use it in an older motor the detergents clean the build up from around seals, which used to keep the oil in.
Once that happens the older motors will leak profusely.

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#17 I'm a Red Motor fiend

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Posted 24 January 2016 - 09:05 AM

Yeah I found the same. The only thing that cast doubt for me was a couple of times I read that the detergents can clean the bores too much and be detrimental to ring seal. Who knows if this is the case though.

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#18 _oldjohnno_

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Posted 24 January 2016 - 11:25 AM

...I read that the detergents can clean the bores too much and be detrimental to ring seal...

Jesus. I wonder who starts these rumours. Anyway, there must be around 15 bazillion engines in the world that run just fine on this stuff.

Don't stress about oil, it isn't a problem.

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#19 _Bomber Watson_

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Posted 24 January 2016 - 11:41 AM

Jesus. I wonder who starts these rumours.

Penrite?

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#20 _oldjohnno_

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Posted 24 January 2016 - 11:53 AM

Penrite?

Ha, I don't think so.

But I'm pretty sure that they started the one that says engine oil should ideally be just a bit thicker than molasses at the Antarctic..

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#21 _Mint_

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Posted 24 January 2016 - 12:07 PM

alot of the new oils are petrol and light diesel engine compatible now

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#22 _Bomber Watson_

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Posted 24 January 2016 - 12:20 PM

Yes, but most of them have no where near enough zink.

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#23 Com_VC

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Posted 24 January 2016 - 12:21 PM

I want to run Caltex Delo 400. Anyone know much about this oil and it's suitability for a Holden 6? Can get 20lt drums for $100

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#24 _Mint_

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Posted 24 January 2016 - 12:41 PM

correct DJ thats why old school style mineral 20w50's etc are still the best for the old 6's and v8's imo

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#25 I'm a Red Motor fiend

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Posted 24 January 2016 - 04:45 PM

Ha, the engine builder I was speaking to also said "DO NOT RUN PENRITE!" As he had heard (yes more unsubstantiated rumours I know) that cases of varnishing has been linked to their oil.