It's time again for the "help me" part of our program:
So I bought all the stuff to change my oil and bring the bike out of winterization. In so doing, I belatedly found that some genius put Grade 70 cycle oil in with the regular multi-grade shelf. So, I'm wondering if this stuff is any good for my Vulcan 1500 twin. Keeping in mind that it stays relatively warm in the garage (above 50) and won't ever get above about 95 during the days here, can I use it? Can I mix it with 'regular' oil? For the record, I tend to run constant rpm's on the freeway for long distances. The oil in question is Castrol 'Grand Prix' 4-stroke motorcycle oil. It does not indicate synthetic.
The recommended oil in the book is: SE or SF (not SH) 10W-30, 10W-40, 20W-40, or 20W-50.
I'm sure I didn't do any damage, but the whole reason for my question is that I discovered this as I was pouring it in and it just looked thicker. So, there's only about a cup in the motor right now, and I'm sure it's not going to hurt anything if it turns out I need to put in a lighter oil.
So, any advice?