Oil Viscosity and Evo's...
 

I was looking in my service manual trying to find what's the rake in degrees for my Fatboy and I ran across the engine oil recommendations and was just wondering, for you guys that live in the warmer climates above 80° f do you use straight 60 weights? And should we...? For me on Long Island I know ambient temps easily get into the 90's and road temps easily get to 120*.. So I was wondering do any of you use Straight 60 weight as recommended? I garage my bikes so cold starts don't get below 50*..

When I was riding shovels, 60 weight was totally acceptable..

one more question, Does any one know what the rake is on a98 Fatboy???

Thanks.. keep warm..

Bob I've been running 20/50 year round. That's in both bike, the Evo and TC.

Thanks Tony.. I was only asking because of what I read in the FSM.. I as well have been running the 20w-50 and when I can find it the Pennzoil 25w-50... Do you happen to know what the rake is?... I'm actually more interested in the rake...

Not sure on the rake Bob...sorry.

Post #7 in this thread said 32 degrees. https://www.hdforums.com/forum/evo-c...and-trail.html

Thanks Tony.. I forgot all about that thread .. Shit I even started it.. Anyways it looks like 32* is the number.. thank you..

Was gonna say 30 or 32 can't remember off hand which it was.

Valvoline dino has been my goto for both straight weights & 20-50 since I started riding.

In your case use 20w50.

Straight 50 or 60 are obsolete nowadays and Evo does not need it, and even if you want use it i would only recommend them in really all-year hot climates... but even in that case you can use 20w60.

60 weight straight oil in the May- October months here in East Texas, and Service Manual straight oil recommendations in all other temps.
. Straight- grade oil has worked consistently for me. The latest-greatest doesn't mean better.
. Best wishes to you,98. Ken

I take it you get the VR1?

Yup, Only reason the manual suggests straights in the summer is lifters and valve train. They can say 20-50 is the same but the engine does rattle less when hot with straight 50 or 60.