TKay

http://www.gmtruckcentral.com/articles/break_in.html

TennisFreak

In for the debate.
I ran this snot out of my current frs on break in.
25k miles later no signs of damage.

Corgidog1

Well according to this article, we should not use synthetic oil during the break in. Guess GM engineers goofed by putting in synthetic oil.

I will go with what the manual says.

ILuvUMan

From Mobil 1's Frequently Asked Questions Website

https://mobiloil.com/en/faq/product-faqs

TKay

A good friend of mine used to be a GM tech. He helped me put a cam in my 79 vet. When we got done and fired it up he told me to run it up to around 3k rpms. He said that is the proper way to break in a new cam and parts.

W88fixer

I think GM powertrain engineers know what they’re doing. Don

rcooper

I am far from a gear head, but when I was a kid I , like many others, built an engine. This was a 289 for my Mustang. We ( an ex Ford mechanic ) did cam, heads, crank ,high rise manifold, 750 double pumper Holly, MT long tube headers and a duel point ignition. Timed it, tuned it and drove the snot out of it. It burned a little oil and I got 60,000 miles out of it. So I am calling BS on this read.
I have had several new Corvettes that I broke in with Mobile 1, never a problem. I kind of followed the GM guide lines about break in. Put 65,000 miles on all of them and never had a problem. So again I say BS.

LanceVette

and look at how many other manufactures use full synthetic from the git-go at the factory, i.e. Mercedes, BMW, etc....

zbrett

I'll pass and just follow the manual. Besides, I only have about 25 miles to go before I pass 500.

OnPoint

According to Katech the newer polymer coated main bearings need a break-in period before getting hammered on.

Plus the gear sets in the trans and rear diff benefit from some easy break-in miles prior to getting hammered on (as will the clutch in a manual trans car).

Seating the rings seems to be far less of an issue than it was 20 years ago.

DAFFYDRUNK

Before I got my car I read just about everything I could find on break in. Then digested it all and came up with a plan I thought would work:

C7 had 2 mi on it. Took it to the gas station to top it off. By then it was warmed up with about 7mi on it. I ran it about 1/2 throttle between 1500 and 4000 rpm through the first 3 gears engine braked the car down in 3rd and 2nd. Did this about a dozen times the best I could without getting arrested or pissing off other motorists.

After that I drove another70 or so mi home varying gears and throttle constantly including plenty of 4k rpm engine braking in 3rd on the highway. Probably shifted the M7 100+ times in an hour. Never took it above 4k or what I though was about 1/2 throttle though.

Once home, my rule has been I can floor it as long as I don't go above 4k. At 300 mi I let myself go to 4500. At 400 I let myself go to 5k. At 500 miles it gets an oil change and then it's game on.

Vetteman Jack

meyerweb

While I agree with you, it's pretty unlikely those engineers wrote the manual. I'll still follow the manual, which doesn't really say to baby the car.

Supermassive

The engine in your Corvette is already broken in, they do that at the factory. Thats why you can getvaway with synthetic as the factory fill. The last bit of "breaking in" that we do as consumers is minor and wont really matter if you drive it like you stole it or grandma it from the dealership. The break in period is more for all the other mechanical systems to break in, like the transmission, clutches, differential, and suspension components that can only be broken in through actual use and not on an engine dyno.

I drive my cars like I intend to from day one mile one, if anything breaks thats what warranties are for. Since GM hasnt made the break in procedure mandatory to maintain warranty coverage its basically advice for paranoid people who think a Corvette is actually a car that needs to be babied.

Walt White Coupe

How many times can this lie be told?


The engine in your Corvette is already broken in, they do that at the factory.

They do not!!

meyerweb

And if you read it on the internet is must be true.

jaden61

for 20 minutes