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Unread 01-25-2006, 10:37 PM   #1
mr.mud
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beak in before synthetic?

this might be a dumb question, but i've heard that you are suppose to break an engine in before using synthetic oil, to let the rings seat.
1. is this true?
2. if it is true, what is considered broken in? 5-6000 miles?

thanks

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Unread 01-26-2006, 06:40 AM   #2
75SV1
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I've heard that too. Still, GM puts M1 in the Corvette from that factory. On an engine I rebuilt in the late 80's, I ran dino oil for break in for about 3000 miles. I really depends on what type of rings you use etc. Also, the break in miles are best if highway miles and some variation in speed. I've also heard to use straight weight oil, but haven't done that myself.
When I rebuilt that engine, I ran it for 20 minutes at between 2000 -2500 rpm. Then I changed the oil. I ran that oil for 2000-3000 miles. Then switched to synthetics. Also, disable the ignition and turn the motor over with the starter till the oil light goes out. Then your engine is fully presurized with oil before startup.
Tom
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Unread 01-26-2006, 07:40 AM   #3
00Vert
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Starting a New Engine

Run a good Dino 20 and 30W weight oil (I mix them) for break in on a new engine for the first 3-5K miles. Problem with synthetics is it lubricates so well, you won't get the wear necessary to seat vital engine parts. Rather than spin the new engine dry, I would recommend you set up a drill motor to the oil pump shaft and spin it (just the oil pump) until you get good oil pressure on the gage and all rocker arms are squirting oil. This is really important to insure your lifters pump up before start up. The reason you run it at high RPM at start up is to seat the cam and new lifters. The camshaft gets lubricated by splash only and you want it lubed very well to break it in. Forget what the new Vettes run, you don't have an LS2 or LS7 motor in that Jeep. I have a Vette too so I know. Even Vettes had a lot of problems with rings never seating though for different reasons. Take Care..........Phil
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Unread 01-26-2006, 10:23 AM   #4
Fullsize_CJ5
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When you break in your engine try to vary the engine speed this helps to seat the rings properly. After about 1200 miles i'd consider it "broke in" I'd run the regular oil for the first 3000-5000 miles. As 00Vert stated, synthetic oils will not let your rings wear enuff to seat properly.
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Unread 01-26-2006, 01:21 PM   #5
75SV1
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First I've heard of Corvette rings not seating. Still, not surprised with synthetics. The Mobil 1 comercials do state both Mercedes and the Corvette motors leave the factory with Mobil 1. I don't know if the break the engine in on a dyno or not. Acroos the street here, they run the engines on a dyno before shipping, but thats for emmissions.
If I were breaking in a new engine, this is what I'd do with the engine ready to run:
I would first prime the eninge while turning the oilpump with a drill. You also need to rotate the engine by the crank with a wrench. This lets oil in the lifters and every where else.
I'd use 30 wt. straight dino oil and a good filter, Napa, Wix, Baldwin or Purolator Pure One.
I'd get some fans to create airflow around the radiator and engine. I'd have a fire extingquisher handy (I wish I could spell).
I pull the ignition wire and use the starter to turn the engine to pump up the oil pressure. When the oil warning light goes out or the oil pressure gage has a steady reading, then I'd start the engine.
I'd run the engine for 20-30 minutes varing the RPMs between 2200-2500 or so. At least for a street cam.
After that, I'd drain the oil and change the filter. I'd probably use straight 30 wt. Dino and the same type of filter as before. I'd try and run the vehicle for at least and hour or more at highway speeds. I'd try and vary the speed a bit. I'd run the oil for maybe 2000 miles then change it.
I'd probably use a multi grade at this point 10W-30 or 10W-40. I like Havoline myself and use the same type of filter. I'd run this about 2000-3000 miles. 2000 would be better.
At this point I still might run a dino oil for 3K more with a good filter or might switch to a full synthetic. I would run more than 5K on a synthetic for at least 2 oil changes. The previous filters will be good for that distance.
When does an engien break in? It realy depends on the engine and how its driven. I've heard of a Ford Escort that didn't set its rings till it was driven on the highway and it was at 20-30K. I've also heard this with a SBC motor. That why I think early on you need to plan some highway driving.
Also, the new motor will smoke a lot in the first 5 minutes or some. Keep an eye on it and have the fire extingusher handy. This is the paint getting cooked on and possible some oil buring off.
Tom
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Unread 01-26-2006, 02:14 PM   #6
jeepboy21
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Quote:
Originally Posted by mr.mud
this might be a dumb question, but i've heard that you are suppose to break an engine in before using synthetic oil, to let the rings seat.
1. is this true?
2. if it is true, what is considered broken in? 5-6000 miles?

thanks

everyone has answered as if you are putting this in a brand new or rebuitl engine. If this is the case disregard my post. if you are just switching to synthetic when its time to change your oil switch to a synthetic blend and run that till its time to change your oil again then switch to full synthetic.
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Unread 01-26-2006, 05:42 PM   #7
bcar240
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What I have always heard for a new/rebuild is to run it for like 500 miles on regular oil, change oil and filter, and run for another 2000 or so. Then switch to synth.
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Unread 01-31-2006, 04:10 AM   #8
KnuckleheadFabs
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Quote:
Originally Posted by 00Vert
Run a good Dino 20 and 30W weight oil (I mix them) for break in on a new engine for the first 3-5K miles. Problem with synthetics is it lubricates so well, you won't get the wear necessary to seat vital engine parts. Rather than spin the new engine dry, I would recommend you set up a drill motor to the oil pump shaft and spin it (just the oil pump) until you get good oil pressure on the gage and all rocker arms are squirting oil. This is really important to insure your lifters pump up before start up. The reason you run it at high RPM at start up is to seat the cam and new lifters. The camshaft gets lubricated by splash only and you want it lubed very well to break it in. Forget what the new Vettes run, you don't have an LS2 or LS7 motor in that Jeep. I have a Vette too so I know. Even Vettes had a lot of problems with rings never seating though for different reasons. Take Care..........Phil
Ditto ditto always run mine at about 2000 for the first 20 mins then drop oil. I usualy dont run syn till about the third change.
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Unread 02-01-2006, 11:16 PM   #9
63FI
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Break in...

Hey guys, when I bought my '01 Cherokee new, I ran it with the factory oil for 300 miles and switched to M1. 50K on it and is perfect.
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Unread 02-11-2006, 08:36 PM   #10
Traveller
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Many engines need a good break in period before running synthetics, particularly the rings and cylinders. An engine may still run fine from the get go with synthetics, but the rings will not seal as fully as an engine that has been fully broken in.

The newer engines that are equipped with synthetic oils from the factory are built with looser tolerances than typical passenger car engines. The looser tolerances allow reduced friction, which increases efficiency and power. For these engines synthetic oil works better than organic oil.

I tend to run 10k miles on an engine before using synthetic oil.
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