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Another oil thread

 
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Adrian
Mad Brick Rider


Joined: 17 Aug 2007
Posts: 98
Location: Weston super Mare, Somerset, UK
PostPosted: Sat May 17, 2008 2:27 pm    Post subject: Another oil thread Reply with quote
OK, but not the usual one Very Happy

Stupidly I managed to buy GL4 gear oil today and openned it before checking. It should have been GL5.

Any gear oil experts out there? Am I OK to use the GL4 stuff or is this a no no?

TIA
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Adrian in Somerset, UK
K1100LT SE
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chopper_harris
Flying Brick Rider


Joined: 28 Dec 2007
Posts: 232
Location: Nr Wigan, UK
PostPosted: Sat May 17, 2008 4:55 pm    Post subject: Reply with quote
GL5 spec oils are high in sulphur (a caustic lubricant) to give high performance under severe load.

This is damaging to brass or bronze components.
GL4 spec oils are benign, but lower performance in-extremis.

The BMW 'box is approved for GL5, so will not contain brass/bronze components.
The GL4 may be OK to use, but out of spec Wink

For the sake of £5 for a bottle of oil, I would not risk it.
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CheapJapCopy
Mad Brick Rider


Joined: 17 Dec 2007
Posts: 137
Location: Berlin, Germany
PostPosted: Sun May 18, 2008 3:28 pm    Post subject: Reply with quote
chopper_harris wrote:
GL5 spec oils are high in sulphur


So THAT'S why it stinks!
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