This will be the second oil change on this new 5.9 ctd. So I know from reading in the past alot of guys have switched to synthetics. now I am trying to figure out when or if I should change to synthetic. Can someone please help me with this. Thanks I searched the posts but did not find what i was looking for.

 

wait to change over to synthetics till after 20-25K. this will give the engine enough time to break in. synthetics do such a good job of protecting wear survaces they will never break in.

 

You can put it in for your first change. Some say ya and some say na. But look at all the high end cars that come with it from the factory.

 

Gol right ahead and do it on the first change less the 25000, it's not my engine, I didn't even switch my gas over till 25000 I going to wait till 50000 on the CTD.

If high dollar cars are broke in on a dyno there not coming with syn from the factory, I know for a fact ams oil stops wear dead, I got and 318 with 180000 and is like new engine wise

 

I'd wait 25~30k before doing the synthetic swap. mine I did around 25k and it may have been too soon since I dont tow. Not sure what to make of it but over the last 10k or so my motor feels stronger than it did back at 25k~30k with the same mods (in stock mode, no box). turbo spools quick, power is great, and as I mentioned in another post, finally hit 19 mpg for the 1st time coming back from whitney...