all right to mix oils?"
Mixing oils with different additive packages or
different chemistry is never recommended. Doing so could compromise the
additive performance of both constituents, cause corrosion of component
surfaces and lead to increased mechanical wear due to the chemical
imbalance. Trending of some oil analysis properties also will be
In a pinch, if the oils are the same viscosity and
base stock, you may be able to get away with mixing for a short time. If you
must mix the oils or live with an accidental mixture until the next
scheduled outage, take the following precautions:
1. Visually inspect for signs of sludge, poor
demulsibility and foaming.
2. Increase the frequency of oil analysis to spot
abnormal wear, corrosion or lubricant degradation.
3. Flush and change the oil as quickly as possible.
A drain leaves 5 to 40 percent of the old oil in the system. Therefore, a
flush will need to be performed.
4. Keep up the frequent inspections and oil analysis
to be sure that the oil stabilizes.
See also in this section: