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Castrol 5w-40 on sale

Although it may be recommended by the manufacturer for some applications, does anyone else here think 5w base stock might be a little light for motorcycle engines, especially in consideration of some recent cam lobe issues?
I believe the 40w rating at operating temperature is due to chain polymers, which are gradually broken down by gears and other high shear areas, eventually resulting in lower viscosity at operating temperature over time.

I realize it is a personal choice based on older motorcycle ownership experience, but i still will not use less than a 15-40 oil in a bike.
 
OldCamper said:
Although it may be recommended by the manufacturer for some applications, does anyone else here think 5w base stock might be a little light for motorcycle engines, especially in consideration of some recent cam lobe issues?
I believe the 40w rating at operating temperature is due to chain polymers, which are gradually broken down by gears and other high shear areas, eventually resulting in lower viscosity at operating temperature over time.

I realize it is a personal choice based on older motorcycle ownership experience, but i still will not use less than a 15-40 oil in a bike.
Click to expand...

I'm not sure. Using 0W20 in my car and cams are fine.
 
I use what the manufacturer recommends. They are the engineers so that works for me.

But as noted everyone has his/her thoughts on oil. My original post was simply a heads up on a great price if you prefer to use Castrol.
 
gsinnc said:
I use what the manufacturer recommends. They are the engineers so that works for me.

But as noted everyone has his/her thoughts on oil. My original post was simply a heads up on a great price if you prefer to use Castrol.
Click to expand...

Yes. Thank you for sharing the good price.
Now, back to our regular programming ...
 
This Castrol I've used in my RT, but also had the cam problem. It looks like the same specs as the Advantek. At any rate doing a 3,500 mi. cycle of oil changes.
 
I just ordered from Amazon another 6 pack for $42.36 plus tax.
 
Last edited:
bdfbeemer said:
Over $50 again.
Click to expand...

If the coupon is still there and you did not use it ... sometime Amazon will let you cancel the order if it has not shipped and they you can just reorder with the coupon.


Just checked and coupon is still there!!
 
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