Bill,
Bill here is good for a humorous one liner that hits your funny bone pretty good, but he is a strongly partisan oil warrior who will spread some disinformation out to a newbie just to get a rise out of the rest of us.
The simple truth is,
avoid energy star car oils as they can cause your clutch to slip
Stay with a last number of 40w or greater. First numbers vary from 10 when you go synthetic because synthetics don't get thick when they are cold. This number helps with winter cold starts and is pretty much meaningless in summer as you engine oil gets hot within about 3 minutes after you start riding (and the second number takes over).
Motorcycle JASO rated oils are preferred but not necessary
Synthetic oils in a stock Savage motor are not necessary
Synthetic oils in a high performance Savage motor may be preferred for heat bullet proofness, but it is not strictly necessary if oil changes are done relatively "frequently".
For example, before Rotella Syn 5w40 oil was invented the standard white jug dino Rotella T 15w40 oil was the preferred performance bike oil on a lot of the crotch rocket boards (for a lot of years too). Ditto for the Gold Wing boards, Rotella T was touted by the Wing boys as "best oil/at best price too" and they were instrumental in getting Shell to test it for JASO and for Shell to pay to get it rated so on the jug.
(kudos to them Honda GoldWing boys for being all stubborn & persistent)
==============================
Parisan information
(firing a 338 Laupa Magnum sniper rifle with a 170 grain pure truth match grade information at Bill's fuzzy fraudulent statements)
Rotella T and T-6 synthetic ARE motorcycle oils that carry BOTH of the JASO motorcycle ratings right on the jug. For Bill to allude otherwise is disinformation and he knows it .....
Yep, your cam chain is gonna stretch some and only ZDDP has shown to have any preventive effect on that (Society of Automotive Engineers rates ZDDP as the "primary and best oil additive ever found to stop galling and premature wear due to oil film failure").
Rotella products have as much as can be put in oil by today's standards of the very much Savage needed ZDDP additive.
==============================
(lobbing a bullshit grenade back at Bill, jest to make him keep his head down)
Bill's favorite stuff
by his own admission is made from virgin olive oil with English vein drippings in it -- so unless you are a budding vampire who wants to pay double/triple $$ per quart for English flavored Italian salad dressing I'd not pay a lot of attention to Bill's oil recommendations.