Not compltely sure why but the Lincoln/Miller EFI Kohlers don't appear to like the 5 -40, They pur along nicely on the 15-50 though. Been using 15-40 diesel oil in all sorts of welder air cooled units for like 10 years in the summer and a 5-40 in the winter with zero problems, was also using 5-50 Ultimate untill they took the Zinc out (plugged up the Cat converters), Defy is good though.Zinc just keeps these engines somewhat cooler. Just a extreme pressure anti wear additive for these high reving engines,, not just for valves.. Been fixing these engines for just over 20years
No announcement yet.
miller bobcat problem need help