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Discussion Starter · #1 ·
So, since Pennzoil motorcycle oil is now officially impossible to find around here (used to get it for <$2.00/qt.), I am forced to change brands. My plan is going with Rotella T 15w40, but I'm concerned about the 15w part. It's winter here in virginia and I will typically ride when it is in the low 20's. Any worries about the viscosity on cold mornings?
 

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according to a quick google search the pour point of rotella t 15w40 is going to be somewhere around -35F to -15F so i'd say that unless you're riding in -F numbers you'll be fine. i've used amsoil 20w50 in the cold with no abnormalities
 

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Discussion Starter · #5 ·
Then Rotella it is. Thanks Andy (and everyone else, but Andy is the professional oil guy).
 

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andyauger said:
Look in the manual. 15W is fine until you get really, really cold.

Do not depend on the pour point as a guide for what will work in an engine. Look in the owner's manual.
don't have one, only have service manual which says to use 10w40, and the pour point is a generally a good assumption, if you have no other info
 

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I say again, pour point is not a good indicator of a good oil viscosity for a particular engine. Always consult the manual, vendor, or a trusted site like this one.

The manual gives the following ranges:
20W-50 oil, 14 F or -10 C to more than 104 F or 40 C
15W-40 or 15W-50 oil, 5 F or -15 C to 104 F or 40 C
10W-40 or 10W-50 oil, -4 F or -20 C to 104 F or 40 C
10W-30 oil, -4 F or -20 C to 86 F or 30 C

The coldest temperature on record where I live is 8 F, so 15W-40 will work for me all year long. Of special interest is the upper limit on 30W oils.

Remember, (example) 15W-40 means the oil acts like a 15W at 0 deg. C and like a 40W oil at 100 deg. C.
 
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