Alternative oil???

[wyldkat81]

Hey everyone,
something someone could hopefully answer for me - gearbox oil for a D REG SUZUKI GP100.....

it says in the book to use 20w/40 but this is no longer made. The guy in a shop said that I can use Castrol SAE 80, is this ok to use?? I have no idea so any info will be cool.

Thanks all
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[cb1rocket]

the dealer has stated pure gearbox oil, thats wrong.

use castrol or any brand of 10W-40 and your be fine

[stinkwheel]

20w-50 is a bit thicker than the 10w-40. I'd probably go for that if I were you. It'll smoothen up the gearchange on an older bike too.
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[Walloper]

https://www.shell.co.uk/home/content/gbr/products_services/on_the_road/oils_lubricants/advance/product_range/four_stroke.html

If it's that old then stale Chip Pan oil is just as good....
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[prawny1]

You could use 10w 40 or 15w 40 in your bike, 20w 40 is for very hot climates Don't be tempted to go for the modern 5w 40 full synthetic stuff as you may well find you burn a little oil from cold (thin enough to be drawn past you crank seal and its stupidly expensive)


I use castrol gtx high mileage in bikes less than 500cc (and all older air cooled bikes) it has less friction modifiers and more viscosity enhansers than other car oils so works well with bikes.

I change mine every 3-4k miles (probably go longer go safely) and the oil is always still nice and clean and doesn't smell at all burnt with no metal particles visible showing it has done its job.

My main bike is a cb1 400 that has 57bhp revs to 13500rpm with gear driven cams bought it with 17k km now showing 30k km and still going strong with no rattles knocks slips etc and the gearbox is as tight as the day I bought the bike all running 10w 40 gtx,

so a gp100 with about 9bhp should be fine funning on the 15w 40 version at £16 per gallon or any cheap car oil for that matter, hell even budget mineral oil would suite it rather than £10-£15 per litre of bike specific oil.

[P.]

cheap tesco 10w40 will be fine...

dont get sucked in to the "high performance" crap...
Oil is oil... 10w40 oil will be fine, any cheap brand of oil should work perfectly...

[wyldkat81]

d'oh!! Wish I had joined this site two days ago!!

Just bought a litre of the SAE80 from a shop.... balls! I guess if it's not opened I can take it back and exchange.

Wierd thing is that they had a CASTROL book for all makes and models of motorbike and the guy even googled the make and they both said to use the same oil, I just don't feel confident that it will be safe or should I say efficient to use instead.

Many thanks for the advice guys
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[prawny1]

The gp 100 is a two stroke so your main oil in the crankcase is just for the clutch and gearbox, 80w may cause you some clutch drag tbh,

Light gear oil or plain 15w 40 would dojust fine,as mentioned above the asda/tesco £4 per gallon stuff would do fine in your bike.

[mr rip]

there's nothing wrong with sticking gear oil in there, I put it in all my two strokes & have done for years,

you might have to put somthing a bit thinner in there for the winter if it gets really cold as you might get a bit of clutch drag
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[Kickstart]

Hi

Engine oil and gearbox oil viscosities are the same. 80 weight gear oil is about the same as a 20 or 30 weight engine oil in viscosity.

There is a table of equivalence here:-

https://www.synlube.com/viscosit.htm

All the best

Keith
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[wyldkat81]

Thanks for that one Keith, bit confusing but am I right in thinking then that the SAE 80 I got will be very similar in performance to the 20w/40??

Thanks for your help
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Smile, it's just another day!

[Walloper]

If you like posh food, clothes, cars, and stuff then you'll fel better with a nice bottle of tailer made oil in your engine.
Maybe the hype is hype but it may be true.

What are race teams using?
That equipment runs at limits civilian equipment will rarely reach.
There are packages added to oils to improve the oil's stability and other stuff.
Some folk swear by Tesco's/ASDA bargain stuff.
It may well be OK but which team runs ASDA oil in a MOTO GP bike?
If you can afford it or fancy it use whatever you can afford.

I know oils can look the same as far as the Nos. go but I won't risk damaging my bike using Non-recommended oil. It's an expensive gamble.

Stick to Bike Specific Lubricants There are additives in car oils not suitable for bikes.
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[Kickstart]

Hi

Viscosity wise it will be about the same. But 10W40 will be less viscous when cold and a touch more viscous when it is hot.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing