Break in 460?

[PBKboater]

Have 1988 OMC 460 and at 28hrs break in time on motor (reman motor) and the Oil starting to look pretty dark. The reman company said to run 4 cycle motor oil for break in to 100hrs. My OEM book says 20hrs. then SAE 30 for my temp range. I went ahead and did oil change to SAE 30. Now my question is that when I had or did a break in on new motors those motors did not get so dirty (dark color) as quickly as this 460 did. Is it due to motor being a Marine motor and running under load all the time? compared to auto! I checked timing, plugs etc.. and everything looks good and motor is running like a champ! And last is it due to the non detergent 4 cycle motor oil?

Thanks
Paul

 

[HT32BSX115]

Re: Break in 460?

Paul,

if you're running Non-detergent motor oil and it's been 20 hrs, I would change it.

I don't think anyone runs Non-detergent motor oil any more even for breakin. (when I worked for an aviation FBO we used to do it but only for about 10 hrs or so...)

Put 15W40 or any 40wt or 30wt in it...



Cheers,


Rick