1999 Jeep WJ, 4.0l, Rotella T6 5w40, 3190 miles, XG16

Joined
Nov 5, 2015
Messages
22
Location
Wisconsin
Last fall I replaced pistons, rod bearings, lifters, push rods and rocker assemblies. The higher numbers I figured would be there from break in, but
the flashpoint is a bit low, with just the trace of fuel in the oil concerns me, but you guys are much more knowledgeable then I, is that something to be concerned about?
I have searched out other 4.0l UOA's and seen a few with higher fuel but flashpoint was higher.
The rest of the engine has 245k miles, I changed the stuff because number 2 piston skirt broke and the lifters made it sound like a baby Cummins..
99% of the miles on this oil was highway.
gladys.jpg
 
Joined
Sep 16, 2003
Messages
3,969
Location
Austin, TX MSA
Probably not too meaningful due to the new parts breaking in, do another 3K and check back. I don't think the flashpoint is a huge deal, viscosity is still 13.63.

Would definitely recommend cutting the filter open if you haven't, check for large shiny bits.
 
Joined
Sep 8, 2005
Messages
15,628
Location
Canada
Break in on a big iron engine will look this, I would just do a few short changes to make sure all stuff is out. Oil physically seems to be in good shape.
 

Slagathor

Thread starter
Joined
Nov 5, 2015
Messages
22
Location
Wisconsin
I did cut the filter open, nothing in there that was worrisome, that I could see anyway, almost to another 3k but could take a while to get there, finally was able to get my car out, Jeep doesnt get a whole lot of miles in the summer.....
 
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