Oil type for old bike?? - Steve Saunders Goldwing Forums

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post #1 of 16 (permalink) Old 07-18-2019, 09:39 AM Thread Starter
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Oil type for old bike??

Hello all, my bike is a 78 with almost 59k on it. The guy I got it from was running Castrol 20w50 T4 oil in it. He said he uses that in all his bikes, I was lead to believe it should be using 10w40. My question is, does it really make a difference and what would be the best oil for this older bike?
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post #2 of 16 (permalink) Old 07-18-2019, 10:12 AM
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20/50 is fine but a lot of people use 15/40 heavy duty diesel oil, rotella or delo 400.
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post #3 of 16 (permalink) Old 07-18-2019, 10:16 AM
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I'm using Rotella T6 in 5w40, it is a pure synthetic, and seems to be doing just fine.

I am also using it in my lawn mower, got tired of having different grades of oil around the shop.
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post #4 of 16 (permalink) Old 07-18-2019, 10:32 AM Thread Starter
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Originally Posted by DaveO430 View Post
20/50 is fine but a lot of people use 15/40 heavy duty diesel oil, rotella or delo 400.
Do you think 20/50 would be better for it rather than 10/40?
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post #5 of 16 (permalink) Old 07-18-2019, 12:22 PM
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Do you think 20/50 would be better for it rather than 10/40?
Honda says 10~40. But what do they know?

You can get Valvoline motorcycle blend oil at Wal-Mart for a very good price.

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post #6 of 16 (permalink) Old 07-18-2019, 12:38 PM
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Do you think 20/50 would be better for it rather than 10/40?
No, one is as good as another. 20/50 may be better if it's really hot but I doubt you would ever know the difference.

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post #7 of 16 (permalink) Old 07-18-2019, 01:32 PM Thread Starter
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Quote:
Originally Posted by Matt78Gl1000 View Post
Do you think 20/50 would be better for it rather than 10/40?
Honda says 10~40. But what do they know?

You can get Valvoline motorcycle blend oil at Wal-Mart for a very good price.
That's what Im running in it now, just wondering if thicker would be better
Thanks!
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post #8 of 16 (permalink) Old 07-18-2019, 01:35 PM Thread Starter
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Do you think 20/50 would be better for it rather than 10/40?
No, one is as good as another. 20/50 may be better if it's really hot but I doubt you would ever know the difference.
Cool, thanks for the input!
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post #9 of 16 (permalink) Old 07-18-2019, 01:56 PM
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Thicker oil will aggravate any starter clutch problems in colder weather.
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Advise given here is free and comes with no warranty "Caveat emptor"

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post #10 of 16 (permalink) Old 07-18-2019, 02:47 PM
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I always ran Castrol 10w-40 in my 1977 GL1000 (14 years).
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