titan307

i read most people like to use either a 75-90 oil or a 75-140 in the tranny. my work uses the royal purple 220 weight. it is a food grade synthetic oil and has been filtered to the nth degree. I can thin it down with some 30 wght if need be.

We use it in our high speed bearings and all our gear sets. it is clear and even when we drain it out after about 90 days or longer you can still see thru it. the machines all run 24/7 365 in temps exceeding 265*c.

Dont want to use if it might be too thick. it actually flows easier than a 90 wght oil maybe becasue it is synthetic.

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The Tank

Take a look at this Self Help Tip on motor oil versus gear lube Viscosity.

Harley Davidson Community (Engine vs Gear Oil)

Personally I don't use gear lube in the transmissions of my two bikes. A good 20W-50 motorcycle engine oil works as well as any gear lubes that you pay extra for. That 20W-50 engine oil will do the job of a 75W-90 gear lube. What you are paying for in most gear lubes is the extreme pressure additive package which our transmissions don't need.

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ironmark

I use Mobil 1 75/90 gear lube in the winter and 75/140 in the summer. The 75/90 is about $9 a qt which is not bad the 75/140 is around $17 a qt. I would think that using the royal purple that you have at work and thinning it out would give you a unpredictable oil viscosity.

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08 Candy Red Sunglo RG,painted inner fairing,103" stage2,V&H true duels,custom FI mapp,Progressive Suspension Touring Link,monotube,440shocks,Heritage style bars,,compensator upgraded, Dakota Digitals Gauges & alot more

03hdfatboy

I use royal purple 75/90 in my baker OD6. Shifts smoother and quieter.

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95" J.E.T heads HQ-0033G KB 10.5:1 Darkhorse Crank Baker OD6 Bassini RoadRage