> ## I had notes on that..since I own a 5000 lb, old style HDX-689.
> I believe if you had dino oil in the gearbox... and wanted to switch to
> synthetic, after draining the old stuff, you need to use some special
> flushing compound 1st. Then after flushing done, and drained,
> the synthetic can be added.
Mobil says there is NO PROBLEM with mixing synthetic oil and natural dino oil
in any ratio for use in cars and motorcycles, so I can’t imagine how there
could be a problem in your gearbox. That gearbox has nothing like the
high-speed shear forces found in automotive applications, and expensive
synthetic oil is a waste.
Flame-proof suit on…
Tom
kf7rsf
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