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Author Topic: heavier oil, leaky head?  (Read 1325 times)

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Greg

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heavier oil, leaky head?
« on: February 26, 2006, 05:52:37 PM »
would putting heavier weight (20w50 in place of 10w40) lead to more seeps and leaks out of the ehad gasket?
thanks!
greg
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Offline TwoTired

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Re: heavier oil, leaky head?
« Reply #1 on: February 26, 2006, 10:50:12 PM »
Not likely.

However, the additives in the oil bottle are another matter.  What brands and type did you got to/from?

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline cb650

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Re: heavier oil, leaky head?
« Reply #2 on: February 27, 2006, 04:01:15 AM »
If the 10/40 was dino and the 20/50 is synthetic.  Highly likely.



               Terry
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18 grand and 18 miles dont make you a biker

Greg

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Re: heavier oil, leaky head?
« Reply #3 on: February 27, 2006, 08:15:27 AM »
i went from 10/40 honda oil to 20w50 castrol. neither is synthetic
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Offline TwoTired

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Re: heavier oil, leaky head?
« Reply #4 on: February 27, 2006, 10:55:16 AM »
Thicker oil is harder to push around the oil passageways.  It makes sense that the gallery pressure would be a little higher.  Particularly when cold. The SOHC4 has an oil gallery running up the cylinder block to the head at each end right next to the head gasket.  Which bike do you have?  Some of them have restrictors up top which would exacerbate the cold high pressure issue.

Was the Castrol designated for motorcycle use, or generic automotive use?

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Greg

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Re: heavier oil, leaky head?
« Reply #5 on: February 27, 2006, 12:16:49 PM »
the castrol was recomended by the local sohc4 guru.
i have a 76 cb550 supersport.
thanks for the input
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WiredForStereo

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Re: heavier oil, leaky head?
« Reply #6 on: February 27, 2006, 04:56:58 PM »
I recommend Amsoil 10w40 Motorcycle oil, I just discovered that it virtually eliminated the oil weep on the head gasket of my cb650.
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