Thread: 20-50w oil swap
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Old 07-06-2015, 08:51 PM
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3Phase 3Phase is offline
XS-XJ Super Guru
Join Date: May 2008
Location: Simi Valley, CA
Posts: 5,465
Talking Day-O!

So, to get back at least slightly on-topic:

The XS11 is in oil heaven right now because they were made when the SAE SE spec moved up to SF. There have been a few bumps in the road but oil has improved quit a bit since the '70s! When I can find it I try to use the Super Tech 20W-50 in the summer and Rotella 15W-40 in the winter.

They're both excellent oils but neither one of them hold up worth spit in an XS11 engine. 2K or fewer miles is the rule and my left foot will let me know when it's fewer. When the shifting starts to get 'notchy' it's time to change the oil and it doesn't matter what color the oil is or how many miles are on it. The only good part it is that they're only slightly more expensive by the gallon than ordering up a hundred-pound block of paraffin that I can shave and blend into a can of warm kerosine as it's needed.

It's hard to find any kind of 50-weight anything oil where I live because it's a high-emissions area of California and the State is trying to get rid of it. When the C.A.R.B. finishes having its way, most of us will be walking or riding bicycles because the only oil anyone will be able to buy will be magical 0W-minus50 Rainbow Unicorn Urine that's so thin and so slick and so colorful and so good for the environment that little birdies circle and sing while it puts fuel back in the tank as you run the engine but it costs $1000/quart and only lasts for one weekend or a trip to San Franciso -- whichever comes first.

Originally Posted by Bonz View Post
Interesting he was worried about Moly levels in a truck engine, and magnesium is used as a normal additive to oil as well.

Motorcraft 15w40 diesel oil (Dino), uses primarily calcium as a cleaning agent whereas most other oils i have had analyzed use mixes of calcium, magnesium and boron.
I'm not sure where the magnesium came from, the guy left that out of his last post. There is good-moly and bad-moly, then there is dousing-your-diesel-with-freshly-mined-dust-moly which is probably not-good-for-it-at-all-moly.

Archoil sells a potassium borate oil additive as AR9100 Nanoborate Friction Modifier and System Cleaner. The 6-liter Ford diesel guys seem to love it because it's not oil of serpente, it actually works and a lot of folks were strung out on Rev-X. Apparently Rev-X doesn't work as well and costs a lot more. Rev-X uses Chevron's version of potassium borate: OLOA 9750.

I have no idea what nanoborate is or how it stacks up against Chevron with F310, errr, OLOA 9750 but the two companies don't seem to like each other. I'm not going to link to either product so you can look them up if you're interested but Archoil recommends AR9100 for motorcycles with wet clutches.

I don't know if I should be mad, glad or sad about whatever-boron but there's a duel going on and that insidious Beetlejuice Banana Boat Song and Death Valley Days are behind it.


Death Valley Days

-- Scott

1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
1979 XS1100SF: "Bush" W.I.P.
2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk"
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