Running In Oil

[JustinP]

What oil are people using these days to run in an engine?

I'm thinking some 20W-50 cheap mineral oil. Should I go for something even thicker?

Car will be run in on a dyno.

Cheers

[Duncan]

yes, 20w50 mineral is exactly what I use

[JustinP]

Perfect - thanks for that

yes, 20w50 mineral is exactly what I use

[Birds]

20w50 will be fine. Nastiest, cheapest shit you can find

[JustinP]

If only we could run this stuff all the time, would make owning a Skyline a bit cheaper!

20w50 will be fine. Nastiest, cheapest shit you can find

[JonnoHR31]

If only we could run this stuff all the time, would make owning a Skyline a bit cheaper!

you can, it'll be cheaper for a while.....

[abr33]

Depends, has your bottom end been blue printed?

And was your block diamond honed?

If both are yes, you dont need to run it in. by the time you've driven it to dyno, its run in. I am using redline 15/50 in mine. it'll do a few hundred kms then ill dump it. (into old work ute)

However if its been done with a stone, yep mineral oil will be the go

[sweefu]

Redline? That is some expensive run in oil!

[abr33]

Im using it for 1000kms... prob less. My engine is blue printed and diamond honed. no run in. i will take it easy on it for a bit though. When you spend 20k on an engine why save a hundred bucks on using shit oil... If your block is'nt diamond honed then yes use mineral and run it in. And a good mineral at that.

[luke gtr]

Hmmm making me think....

Either way, I used motul 4100 turbolight to run in, 1000ks, then oil and filter change.

Seems to be going ok so far....

[Gerg_R31]

honed with either diamond or grit based stones are irrelivant for this topic,

if the bores have been followed with plateu stones or a bottle brush hone, then THAT will reduce the wear in time as well as remove any roughness and folded metals in the cross hatch. Diamond stones wear slower during the machining process and in the long run are cheaper for the machinist, (i.e grit stones do 30 bores and diamond stones do 200 bores) plus its easier for them as they dont have to try to compensate by minipulating the honing procedure, if they are using unevenly worn stones. Only benifit of a 325-500 grit diamond stone over a 400-600 grit based stones is the diamond leaves a slightly better RA rating

but yeah + 1 to mineral oils at first

[boostn0199]

Just curious what is the procedure guys are using the run in there built motors always have heard mixed answers?

[Duncan]

always run a motor in reasonably hard (ie about 50-70% load with little or no boost), up to about 70% of max revs. And never let the motor idle or run at the same revs for a long time.

The days of doing 5000klm on 10% throttle are long gone. Tolerances on a modern motor are much tighter and more accurate, and everything is over very quick.

Personally I:

1. Unplug the CAS, and crank on the starter until there is some oil pressure

2. Run the motor at idle until the thermostat opens. Check there are no water leaks. About 5 min.

3. Drive it to a dyno and run it in for 100klm, or do 200ish klm on the road. Run it at medium load with no boost, regularly varying revs.

4. Drop the oil and change the filter, this removes 90% of anything you missed in the cleaning.

5. Run another 1000-4000klm on mineral oil depending on if it's a race or street motor (change the race motor to synthetic earlier).

6. Compression test. Be happy about the results. Enjoy

[JonnoHR31]

^this

do not baby a freshly built motor for 5000 k's to "run it in". the entire run in will be over after the first drive which should contain a wide variety of revs and load

[pipster11]

Bursons sell running in oil, just sayin

[juggernaut1]

JustinP,

I've got about 9 litres of Penrite running in oil (15-40) you can have if you want it.

Just PM me if your interested.

Cheers

[JustinP]

Thanks juggernaut1! Much appreciated, will send you a PM.

JustinP,

I've got about 9 litres of Penrite running in oil (15-40) you can have if you want it.

Just PM me if your interested.

Cheers

[gotRICE?]

Im just curious. How do you load up the engine to 70% with no boost?

[GTScotT]

Im just curious. How do you load up the engine to 70% with no boost?

Light throttle and extend the revs between changes.

As an example go redline 1st gear and keep it off boost, you will find its far from impossible and is extremely good for pissing off people giving you hoon pinkys for having a 'loud muffler'.

[gotRICE?]

Sweet. I was always under the impression that loading, and revving are a little different. But if thats all it means then its easy peasy haha.