OIl gushing out of dip-stick: Now I know why!

[Moor]

Mercruiser 260 V8 GMC. on my last post I had several useful suggestions: blown piston rings , defective valves , gasket wrong way round etc.<br /><br />Well it turned out that Ihad ded to use a synthetic 0W-50W oil. bad choice..<br /><br />Oil turned out to be too thin not only did it spurt oil from dip-stick but ceated a lot of smoke from breather. Changed oil to 20W-50W problem solved no oil gushing form dip-stick , smoking dissappeared.

 

[Walter]

Re: OIl gushing out of dip-stick: Now I know why!

Mario...<br /><br />Maybe Trent or Fone_Man can explain the "whys"...but I believe Merc recommends using only single grade oil in most their I/O units. Use whatever your service manual calls for.<br /><br />Walt

 

[Boatist]

Re: OIl gushing out of dip-stick: Now I know why!

30 weight unless your running a ice breaker. Does not break down near as fast as a multi. Every manufactor I check recommends stright weight oil.

 

[6MISFITZ]

Re: OIl gushing out of dip-stick: Now I know why!

Ditto OMC S.A.E 30<br /><br />Funny that the dealer put in a multi grade for winter storage though!