gas in oil crankcase. How else could gas get into oil.

[boscoe99]

What does "working easiest" mean?

Is it doing less work or having less stress or ?

[99yam40]

I broke mine in by the book. Used dino oil in my 2014 F300s from 0-700 hours, and synthetic from 700-1050. No oil made from 0-800 hours, but both have been making oil from 800-1050 hours. I'm over 5% fuel dilution regularly now. I also stopped using ring free from about 600-900 hours. I ***** alot. I've switched back to dino to see what happens - should know in a few months if wind ever stops blowing.

My list would be, in no particular order:

1. Break in by the book - up and down with some high rpms to help get seated.
2. Use ring free.
3. Change thermostats as recommended.
4. Ethanol free fuel if possible.
5. Dino oil, instead of synthetic.
6. Run WOT occasionally when possible.
7. Sure I'm forgetting some . . . .

Is it possible that stopping the use of ring free might be why your F300s started making oil after 800 hours?

if the dino oil does not make it go back away, try using the ring free again

[28Regulator]

Is it possible that stopping the use of ring free might be why your F300s started making oil after 800 hours?

if the dino oil does not make it go back away, try using the ring free again

Could be. I have been using the ring free again consistently for the past 150 hours, but that has not helped. Also been doing the wot thing, and that also has not helped.

[Rick teece]

I’ve got a 2007 Yamaha 50hp, checked lp fuel pump with bulb and it’s fine, am stuck on what to check, as theirs fuel in the crank case? Not a marine machanic and can’t afford to take it to a shop.? Anyone know anything for diagnosing this or to help?.

[99yam40]

this thread is about 4 stroke motors making oil, a 2007 Yamaha 50hp is a 2 stroke

[boscoe99]

I suspect the OP has a 2007 F50TLR but only he knows for sure.

Mr. OP - Please start a new thread and in there state the full model of your motor. One F, one T, one L and one R can't be that hard.