Posted by Rick Kr on October 10, 2010 at 20:23:56 from (67.108.90.72):
From the last post: I was running TSC 85w140 in a new 6 ft tiller and the oil had foamed.
Lots of people said just run it, its fine, others said get a better oil, TSC is cheap oil, some said synthetic.
I pulled all the oil out the gear box with a vacuum pump. Only the top 1/2 inch was foamed/bubbles. The rest of the oil looked fine. The side case, I pulled the drain plug and the oil came out good too. So I didn"t drain all of the side case.
I filled the gear box with new valvoline, and had to top off the side case with 12 oz. of valvoline. I then went out and tilled 3 acres at 540rpm on the PTO. A full 4 hours of running.
The results: Absolutely no foam in the gear box or side case. Both cases looked perfect without foam or little bubbles (air entrenchment).
I guess I am wondering does the valvoline and other better oils contain some sort of anti-foaming agents? The side case had 48oz of TSC oil topped off with 12oz of valvoline. Was the 12oz enough to stop the foam? I can"t think of another way to test it, 4 hours straight. I checked the temp of both boxes with my hand, neither was too hot to hold on to (yup, I shut off the PTO).
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