Royal Purple Max-Cycle 10w/40

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4000 ppm of Phosphorus? I guess it's not SM rated?

I think the Moly/clutch issue has been covered here many times. I don't think that Soluble Moly can hurt a clutch, especially if it's in a "Motorcycle" oil.

-T
 
ok, i'll bite...


what's an SM rating, and why is it significant?

(i did try a search, but it yielded similar references to the one above.)


edit;
never mind, i googled it.

[ July 13, 2005, 01:57 PM: Message edited by: maize ]
 
as reported by Blackstone (and Dyson)


-----------tested / univ. averages

alu--- 6 / 12
chr--- 0 / 1
irn--- 0 / 41
cop--- 0 / 4
lead-- 0 / 2
tin--- 0 / 2
moly- 441 / 467
nick- 0 / 1
mang- 0 / 1
silv-- 0 / 0
tit--- 0 / 0
pot--- 0 / 1
bor--- 8 / 8
sil--- 8 / 8
sod--- 2 / 5
cal--- 2599 / 2839
mag--- 13 / 17
phos-- 4085 / 4320
zinc-- 1222 / 1295
bar--- 1 / 1


-----------------nominal / actual

sus visc @ 210f- 64-75 / 69.9
flash f-------- >370 / 385
% fuel-------- antifreeze----- 0 / 0
water--------- 0
insolubles----- 0

it isn't clear to me what value the universal averages have here as i assume that the refer to UOA, not VOA. and i am also unclear what differences, if any, there are between RP Max-Cycle and their normal 10w/40, or what Blackstone's univ. averages refer to there either.

i will post UOA in appropriate area. please feel free to offer any and all comments as i am completely new to this oil analysis business. i'm curious what factors may or may not be different for motorcycle engines and mc-specific oils. it has been suggested to me that the high moly content could cause clutch slippage, tho i haven't experienced that nor heard of it happening as a result of RP use. i'm also interested in the differences between the Max-Cycle and RP racing oil.

thanks
 
That is a hefty dose of Phos.

You see this quite often in Industrial Gear lubes but have never seen this level in 4-cycle oils.
 
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