Engine Break-in

[FreeBeeTony]

After hour many hours should the oil be changed on a completely rebuilt engine (165 Mercruiser IL6)?

 

[FreeBeeTony]

Re: Engine Break-in

bump

 

[DJ]

Re: Engine Break-in

FreeBee,<br /><br />You could think of it in automotive terms. One hour is pretty much universally equivelant to 40 miles.<br /><br />Many auto makers say replace the oil after the first 2-3000 miles.<br /><br />I know you put a lot of work into this. I would feel most comfortable changing it after 20 hours-the first time and 50 thereafter.

 

[FreeBeeTony]

Re: Engine Break-in

Thanks djohns, I only have about 5 hours on it so far. At this rate, I might get the whole season out of it before I have to change it! I can't get out on it as much as I would like to.

 

[chris in va]

Re: Engine Break-in

1 hour equals only 40 miles? I can't see how that would work. I have 300 hours on my 94, and it's got WAY more than the equivalent of 12,000 miles on the ticker. I'd say more like 120,000.

 

[DJ]

Re: Engine Break-in

Chris, <br /><br />Well, as I said. That is the automotive equivalency standard. It is used throughout the industry for vehicles that use PTO's and idle for extended periods.<br /><br />Granted, auto. engines in boats work harder, that's why I offered a (somewhat agreed upon) marine "standard".<br /><br />But, what do I know.

 

[Bondo]

Re: Engine Break-in

I don't know about Anybodies "Standards"......<br />My experince tells me that a 1000hrs motor has traveled about 100,000 automotive miles....<br /><br />For Oil Changes, I live by the 20hrs(30W oil), then Every 50hrs......NAPA Gold filters,+ Mobil1 15W50....