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Never use synthetic oil or multi viscosity oil for new engine break in?

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Never use synthetic oil or multi viscosity oil for new engine break in?

Old 10-08-2016, 07:43 PM
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Default Never use synthetic oil or multi viscosity oil for new engine break in?

I was at Autozone today and overheard a conversation. The customer said he had a brand new truck and asked if there was an additive or something special to use when breaking in a new engine. The Autozone dude behind the counter told him that they carry "break in oil" but said he didn't think it was anything but just regular oil that they charge more for.

An old timer (customer) interrupted the Autozone guy and the customer to tell them the proper way to break in a new engine is with straight weight dino oil only. If you break it in with synthetic or use multi viscosity dino oil you will not be breaking it in properly and will potentially be damaging the engine. He mentioned that the rings will not seal properly and a good possibility of scoring of the cylinder walls.

We have 3 vehicles at the house that we bought new and I'm assuming all of them came from the factory with Mobile One synthetic oil. Does anyone know if new cars come with straight weight dino oil instead of synthetic like Mobile One which is what the car makers say to use?

I did some Internet searching and sure enough I read that you shouldn't use multi-viscosity oil or any kind of synthetic oil in a new engine. I have owned cars for almost 40 years and I have NEVER heard that you need to use straight vis dino oil only for break in. What oil do new car manufacturers put in the cars when they are new? If they just use straight dino oil is this one of the reasons they recommend changing the oil sooner than the regular service intervals that the manual shows? I always thought they recommend changing the oil sooner was because of possible metal shavings or metal chunks that are normal during the break in period.

The old timer @ Autozone acted like this is something everyone knows......well I sure didn't know this. If it's such common knowledge I sure hope the car manufacturers are putting in the proper break in oil!

How many of you guys knew this? I'm a car guy and I never knew this, I have never even heard of using a different oil for break in -vs- after break in.
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Old 10-08-2016, 07:48 PM
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Used to be a very good recommendation, and still is for non factory built engines & any engine that doesn't ship with synthetic oil in it. Machine work at the factory level has negated the need to do this in the ones that ship with synthetic in them. Also still a good recommendation for small engines.

Only thing really necessary these days is to drive the thing, preferably modestly hard with varied RPM. I also like to do the first oil change around 2k, and shift to the regular interval after that.
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Old 10-08-2016, 08:15 PM
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Many, many cars come from the factory with synthetic oil. No need for dino or single weight oil for break in.
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Old 10-08-2016, 08:20 PM
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Pure BS. There is no break in oil, or period. Just drive it, and enjoy life.
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Old 10-08-2016, 08:22 PM
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And small B&S engines come with oil in them; 5 hours run and change the oil
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Old 10-08-2016, 08:24 PM
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Originally Posted by RussH View Post
... The old timer @ Autozone acted like this is something everyone knows......well I sure didn't know this. If it's such common knowledge I sure hope the car manufacturers are putting in the proper break in oil!
The old timer likely was letting his experience with or as a re-builder cloud the truth that a lot of new high performance engines get synthetic oil from the very first glug glug...
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Old 10-08-2016, 08:29 PM
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So that's what happened, I had a Toyota taco with over 500k no engine trouble when I sold it, I only used mobile one.... new at dealership to the selling date....
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Old 10-08-2016, 08:49 PM
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All bs, if the guy knew what he was doing, he wouldn't be a clerk at the autozone.
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Old 10-08-2016, 09:09 PM
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when that old man worked on engines, they would last 70k and need new head. Times have changed. almost every engine is mulitweight oil from the factory and high hp engines use synthetic. engines now go 300,000 miles now without doing anything . he is Old school
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Old 10-08-2016, 09:20 PM
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Originally Posted by RJTaylor View Post
Pure BS. There is no break in oil, or period. Just drive it, and enjoy life.
I don't know if you are right or wrong but there is sure a lot of info online that disagree with your opinion. There is also several products on the market call "break in oil".
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Old 10-08-2016, 09:23 PM
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Originally Posted by Time Machine View Post
All bs, if the guy knew what he was doing, he wouldn't be a clerk at the autozone.
Huh? The clerk didn't recommend any special oil, you must have read my post wrong or only part of it.
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Old 10-08-2016, 11:13 PM
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Originally Posted by RussH View Post
I don't know if you are right or wrong but there is sure a lot of info online that disagree with your opinion. There is also several products on the market call "break in oil".
For any oil related questions, check out www. Bob Is The Oil Guy .com. They know everything even remotely related to oil and engines.
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Old 10-09-2016, 04:26 AM
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Originally Posted by RussH View Post
I don't know if you are right or wrong but there is sure a lot of info online that disagree with your opinion. There is also several products on the market call "break in oil".
Not sure if this is new to you....there is a lot of terrible and not correct info on the internet. Also of course there and an oil called "break in oil" that cost more.....why wouldnt there be for people whom believe that junk. I am sure it's in the Isle with blinker fluid.


<------ Service manager for Toyota who 90% of their new cars come with synthetic 0-20 oil in them. Never before worked for any other brand that car more cars with 300k on the dash, original engines, and running fine. In my time, i have worked for Nissan, Kia, VW, and GMC.
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Old 10-09-2016, 04:32 AM
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Originally Posted by RussH View Post
I don't know if you are right or wrong but there is sure a lot of info online that disagree with your opinion. There is also several products on the market call "break in oil".
Well there is the Spanish fly stuff on the counter at most gas stations too.

BMW sends their cars out with synthetic and no oil changes for 12000 miles because synthetic is just that good. Of course other manufacturers who don't cover the maintenance for the first 50k of a cars life want you in regularly spending $ so what better way to do it than change the oil all the time.
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Old 10-09-2016, 05:44 AM
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Originally Posted by fireisland1 View Post
when that old man worked on engines, they would last 70k and need new head. Times have changed. almost every engine is mulitweight oil from the factory and high hp engines use synthetic. engines now go 300,000 miles now without doing anything . he is Old school

This. He is living in the past. We were told to change oil @ 3k back in the day and grease the fittings.

Things have changed.
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Old 10-09-2016, 05:45 AM
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My limited understanding this is it used to be true. New motors are built so much better today than years ago. All the bearing tolerances are much tighter and synthetic oil is not a problem because of it. My new toyota came with synthetic from the factory.
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Old 10-09-2016, 05:54 AM
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Originally Posted by RJTaylor View Post
Pure BS. There is no break in oil, or period. Just drive it, and enjoy life.
This. "break-in" is a thing of the past. Many brand new cars drive right off the assembly line and onto a chassis dyno. The LAST thing you need to do anymore is wear something in an engine.

Old wives tales die hard. This is one.
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Old 10-09-2016, 05:57 AM
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Originally Posted by alka2710 View Post
My limited understanding this is it used to be true. New motors are built so much better today than years ago. All the bearing tolerances are much tighter and synthetic oil is not a problem because of it. My new toyota came with synthetic from the factory.
Al
Yep.
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Old 10-09-2016, 05:59 AM
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Tighter tolerances better oil distributions and over all improved engine management with computers have lead to better over all longevity with superior lubricants
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Old 10-09-2016, 06:08 AM
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I'm afraid the "old-timer" has old information.

It's pure poppycock. Many new cars come with synthetic oil from mile 1.
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