Brake in oil question
 

I had the engine for my Blazer rebuilt and was broke in on a stand. I still have the brake-in oil engine and start it regularly. Should I drain it and add new oil or keep running because it's not road-ready.

Re: Brake in oil question
 

I would leave it in there...

If the rebuilt engine is a flat tappet cam, any replacement oil MUST contain a ZDDP oil additive, as modern oil do not have Zinc content due to it causing catalytic convertor failures.

If the engine has a roller cam and lifters you would be fine with a modern oil...

Have fun!

:chevy::chevy::chevy:

Re: Brake in oil question
 

Generally you'll run 500 miles before the first oil change. Unless you're running it for a long time each time you start it, it's going to take a while to equal as many running hours. Plus, putting a load on the engine helps break it in. I'm with Aussie; leave it in there until you get the engine in the truck and then make sure you use the proper oil when you do change it.

Re: Brake in oil question
 

Compared to a lot of other things, Oil is cheap!
I’ve always changed it after break in. Partly from piece of mind. Mostly to look for metal in the oil and filter.

Re: Brake in oil question
 

Me too. Since this oil ZDDP fiasco started, I now break in a flat tappet engine with break-in oil, drain it, change oil and filter and use ZDDP additive, and then change oil and filter and add ZDDP again after 500 miles.

Gary

Re: Brake in oil question
 

It was broke in with good grade oil and the motor is now in the blazer. I start it fairly regular and I move it around some, but it's not ready for the road yet.
new oil can't hurt too much.
Thanks guys.

Re: Brake in oil question
 

Okay, guys. I drained the original break-in oil (mainly to see if I had metal stuff) and it showed to be really clean. My question If it was broken in with 30wt and because they sent me 20-50wt instead can I run it.
Did I mention it was in the Blazer.

Thanks for any info.

Re: Brake in oil question
 

You live in cold country.
No need for heavy oil.
I’d run 10w30.

Re: Brake in oil question
 

Thanks geezer. I'll have to send the Lucus 20-50 back and get the 30wt.

Re: Brake in oil question
 

10W30 is suitable for varying temperature ranges and also works well in cold weather. Not SAE 30 or 30W.

Re: Brake in oil question
 

Valvoline VR1, hands down a great oil in my book. 100k on my rebuilt engine with it. Flat tappet cam.

Re: Brake in oil question
 

I used to run straight SAE 30wt in all my rigs until about the mid 1990's. Now I run 10w30wt in all my rigs.

30wt for one is hard to find. It is also specified for break-in oil because it used to be a non-detergent oil. Not so much anymore. Don't run 30wt in your rig. Your lifters and bearings will thank you for using 10w30 in cold weather.

Gary