ponytug
Super Member
Old engines with old seals can dry out with synthetic oils- then they leak. Mechanics generally are talking about pre-unleaded gas. Your vintage engine isn't that old. It should be fine. There is lots of literature out there on the issue.
Getting crud off a seal can cause it to leak after you change the oil, but that is true of any clean oil, synthetic or otherwise.
It is the same issue with fuel. Changing to ethanol from non-ethanol gasoline can dissolve crud, same with switching to biodiesel (even if it is clean). The solvation power of these liquids are all a little different, and older engines / fuel lines / hydraulic lines will have more crud in them to get loosened up.
For air cooled gasoline engines, the fuel is an important part of the cooling and switch from a non-ethanol blend to an ethanol blend will change the cooling power, and you may need to adjust the octane ratio to compensate. Again, lots of literature out there, if you look for it.
And, yes WoodlandFarms, I do mow with a chainsaw hard hat and mesh face shield. I won't tell you how often debris has pinged off it. (And ear plugs, with over the ear hearing protection, the 72" brush cutter is not quiet when it takes out big items of brush.)
Live long and prosper.
All the best,
Peter
P.S. Spell checkers are amusing in their own right. Mine changed solvation to salvation, which may have been an indication for the quasi religious tone to some fuel / lubrication discussions.
Getting crud off a seal can cause it to leak after you change the oil, but that is true of any clean oil, synthetic or otherwise.
It is the same issue with fuel. Changing to ethanol from non-ethanol gasoline can dissolve crud, same with switching to biodiesel (even if it is clean). The solvation power of these liquids are all a little different, and older engines / fuel lines / hydraulic lines will have more crud in them to get loosened up.
For air cooled gasoline engines, the fuel is an important part of the cooling and switch from a non-ethanol blend to an ethanol blend will change the cooling power, and you may need to adjust the octane ratio to compensate. Again, lots of literature out there, if you look for it.
And, yes WoodlandFarms, I do mow with a chainsaw hard hat and mesh face shield. I won't tell you how often debris has pinged off it. (And ear plugs, with over the ear hearing protection, the 72" brush cutter is not quiet when it takes out big items of brush.)
Live long and prosper.
All the best,
Peter
P.S. Spell checkers are amusing in their own right. Mine changed solvation to salvation, which may have been an indication for the quasi religious tone to some fuel / lubrication discussions.