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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?
Thanks
 

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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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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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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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Tried 20w50 in the 1100 once. Starter clutch didn't like it one bit if it was any cooler than 50°... Otherwise was just fine.
 

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I ran 10-40 Shell Rotella in my 80 GL1100 from the day I got it in 1998 until I sold it last summer. I ran that as I had a VW Rabbit Diesel and bought it by the case of 6 gallons at a time. Did not have the room for different kinds/weights of oil around. Also ran it in both of my Caravans and now the GL1800 and GL1500, plus my wifes RAV 4 Toyota. Have not had any starter clutch problems with the bikes or anything else.
 

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I ran 10-40 Shell Rotella in my 80 GL1100 from the day I got it in 1998 until I sold it last summer. I ran that as I had a VW Rabbit Diesel and bought it by the case of 6 gallons at a time. Did not have the room for different kinds/weights of oil around. Also ran it in both of my Caravans and now the GL1800 and GL1500, plus my wifes RAV 4 Toyota. Have not had any starter clutch problems with the bikes or anything else.
A modern engine has WAAAYYY closer tolerances than a 1980 G/W ever had. You are hurting the engine by running 15W40 oil in a RAV 4. Probably asks for 5W20 or 0W20.
You probably meant 15W40 in yer post? No 10-40 Rotella.
 

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my Pontiac Vibe specifies 0w20 or the warranty is void.

my 2001 Chevy Suburban specs 5w30, and then is nearly 20 years ago.

I just use pure synthetic in everything we have, right down to the lawn mowers.
 

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20W 50 is for air cooled motors. I would stick with 10W 40 in the wing. That is what it called for. I never had any problems running 10W 40 dino oil in my 1500 in the desert south west summer temps of 100+ degrees.
 
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