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Makotosun

Correct Gearbox Oil for DT3

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Correct Gearbox Oil for DT3 was created by steam_biker

I've been using 10w 40 oil in my DT3 gearbox, I have read that light gear oil is better. What do other people think?
  
Yamaha DT3 1973
Yamaha FZR 1000 Genesis 1987
Suzuki GS500e 1989
Yamaha FZR 600 Genesis 1991
Yamaha YZF 750R 1993 Yamaha FJ 1200 1990
Yamaha FZR600R 1994
Last edit: 16 Apr 2022 09:48 by Enduronut.
16 Apr 2022 08:17 #1

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Replied by asco on topic Correct Gearbox Oil for DT3

Going by memory YAMABOBINTX used Castrol 10 - 40.
I like the synthetic blend sold at Cycle Gear.
i doubt you need to go lighter.

a
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1971 CT1-C (BRANDY)
1970 DT1-C (MONICA)
1972 AT2M (ZIFFLE)
1970 CT1-B (HULK)
1971 DT1E (GINA)
1970 CT1-B (CLIDE)
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16 Apr 2022 08:22 #2

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Replied by Schu on topic Correct Gearbox Oil for DT3

I use the same as you
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
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Last edit: 16 Apr 2022 08:29 by Schu.
16 Apr 2022 08:28 #3

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Replied by MarkT on topic Correct Gearbox Oil for DT3

Whatever oil you choose, make sure it is rated for wet clutches.  Most modern automotive oils have "energy conserving" slippery additives that can sometimes make clutch slip.  Some of the Shell Rotella oils have the proper JASO M ratings...  as do many motorcycle-specific oils.

Then there are the "boutique" oils...  I personally run Torco MTF-L as I scored a couple of cases cheap on ebay from a shop that closed down.  It's a lightweight oil...  gear oils have EP (extreme pressure) additives that do protect gears better.  Especially good for straight cut motorcycle gears.  Maxima makes a good line of motorcycle gear oils as I'm sure do others... 

When I was racing, there was visibly less "metalflake" in the oil when draining when I used motorcycle gear oil.  Maxima also did a study with their Supercross bikes and found measurably less wear in trans...  (worst gear wear was found in bikes running ATF in trans)

That said, unless you ride a whole bunch or have modified for a lot more HP or something, you're not likely to see any real advantage.  Just change the oil often as recommended in manual...  every 2,000 miles I think it is? 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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16 Apr 2022 08:45 #4

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