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Post by dave1 on Sept 20, 2012 0:27:21 GMT
just wanted to know if it would damage the engine to run it on 20w50 as on my gpz600r they suffer from a clutch rattle and i know a few people changed the oil to thicker to dampen an it did work ?
input appreciative
dave
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Post by CD on Sept 20, 2012 8:34:06 GMT
Multigrades need to be thin when cold and thick (relatively) when hot
20w50 is old school oil. Its too thick when cold so takes longer to get into the bearings and its not much thicker when hot than 10w40. It also wont last long when its being smashed by gears and high speed engine parts. The best is 5w50 if you can afford the expense.
Sort out the clutch. At least on a (UJM) bike, the engine doesn't have to come out.
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Post by DahDit on Sept 20, 2012 9:07:43 GMT
The GPZ600R was watercooled in-line 4 (and also my first big bike  ) so technically was less old-school than the Divvy...... I can't see any harm in trying the oil as long as its specs meet/exceed the manufacturers requirement of API "SG" onwards. 20w50 isn't a thicker oil per se. The added polymers specific for each grade slow down the rate at which oil thins out as the temperature rises to meet the required specs. www.fivestarautomotive.co.uk/ekmps/shops/fivestar/resources/Design/oil-temperature-chart-leeds-yorkshire-uk-fivestar-automotive.jpgYou probably won't be operating the bike's engine outside those for 20w50........ If anything, as the Divvy is air-cooled, SAE50 would be better for temperatures reached in high summer temperatures when stationary in traffic  The air-cooled Guzzi shares the same oil (10w60) as is required for Subaru Impreza's and BMW M Sport engines to handle the heat. Sadly the bike doesn't share the same performance levels tho' ;D |
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Post by HRHpenfold on Sept 20, 2012 10:17:02 GMT
well I would not put it in my GPZ600r, because when it's cold it needs thin oil, especially as they rev their nads off when on choke, much safer to use earplugs |
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Post by m40man on Sept 20, 2012 10:58:40 GMT
I'm with HRH on this. ... high summer temperatures when stationary in traffic We don't get high summer temparatures, & we especially don't sit stationary in traffic  ! Additional: If the manual says it's OK, it's OK. If not, put in a grade which the manual says is OK. |
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Post by CD on Sept 20, 2012 10:59:08 GMT
The on-choke revving can often be adjusted out on the throttle linkage so the revs don't go so high when choke is on.
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) so technically was less old-school than the Divvy......
!