HOw soon is to soon for synthetic?

[JARichard]

I know the engine needs to to 15k for proper break in!



But what about the nv5600 and the rear end?



The last couple of days my transmission is real notchy going into 2nd and 6th 6300 miles. Remember I bought this 05 in June brand new!

 

[05mxdiesel]

The whole 15k on the engine is arguable on who you talk too. The diffs call for synthetic and came with it. I swapped mine whole truck to amsoil at 15k. The amsoil made a huge improvement in the 5600.

 

[Diesel Power]

i highly reccomend amsoil as well, i did mine at 12k

 

[RSeymon]

ditto on all the above,



Switched over to AMSOIL last week end engine and rear end millage at time is 4750, will do trans at 15,ooo

Good luck

 

[RobertP]

same here did mine to amsoil at 19,k absolutely love it.

 

[jersey diesel]

why wait?

I am wondering why we should wait to switch to synthetics? I swithched to synthetics as soon as I brought my gassers home from the dealer. Never had a problem and both went 150000 miles without any engine problems. But I did wait on my deisel because that is what everyone here said to do, I just don,t

know why we wait.

 

[betterthanstock]

I just don,t know why we wait.

Because these are commercial engines that require 6000 miles of heavy towing to break in, or 20-30K empty, and Cummins recommends breaking in on mineral oil to seat the piston rings faster, and improve mileage faster. Other wise it may take you 50K empty on synthetic, and too little friction and too much blow by will glaze your cylinder walls and cause problems.

 

[JARichard]

YOU guys missed the point!

I know the 15k on the engine is to break in better!





But what about the transmission? I forgot the diffs come with synthetic!

 

[Diesel Power]

YOU guys missed the point!

I know the 15k on the engine is to break in better!





But what about the transmission? I forgot the diffs come with synthetic!

the transmission is very important, run amsoil in everything! the junk they put in the ft and rr diff could'ent hold a candle to a real synthetic. if you want to see click the link at the bottom of my sig. Oo.

 

[Graphic man]

some vehicles come from the factory with synthetic in them



Scott

 

[BHolm]

Glaze your cylinder walls???????That seems pretty far fetched to me.



I switched the engine, diffs and t-case to Amsoil at 1000 miles on both my '05 and my '06. The '05 was well broken in, with a good milage improvement by 25k miles, just like my '06 now is. Mine are all autos so I haven't reached the change interval on that yet but it will get Amsoil as well.



There is no good reason to wait IMO.

 

[Paladin1911]

YOU guys missed the point!

I know the 15k on the engine is to break in better!





But what about the transmission? I forgot the diffs come with synthetic!

Your trans has synthetic in it right now. You won't hurt a thing by switching to synthetics. I have Amsoil front to rear. Good stuff.

 

[nickleinonen]

Glaze your cylinder walls???????That seems pretty far fetched to me.

if glazing of the liners is going to happen, it will happen within the first 10 hours of a fresh engine being fired up. . you can have a brand new fresh engine broken in on a dyno in about an hour. . it doesn't take that long [plateau honing on the liners/cylinder walls cuts break in down by a lot]