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'best' conventional 10w-40 pcmo for wet clutch bike #5291356 12/11/19 10:32 AM
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kmrcstintn Offline OP
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I am seeking feedback on what folks feel is the 'best' conventional 10w-40 pcmo for use wet clutch bikes...before someone tells me to spend the 'extra few bucks' on motorcycle oil I wanna let it be known that I do shorter OCI's deliberately to reduce shearing; those 'extra few bucks' add up! I also want to use 10w-40(vs 15w-40 hdeo) for better flow during cool temps...


'15 Jeep Patriot Sport (2.4L 4-cyl), '13 Genuine Buddy 125 (125cc air-cooled thumper), '14 Yamaha V Star 250 (250cc air cooled v-twin)
Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291361 12/11/19 10:37 AM
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Chris142 Offline
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i have ran "Car" oil in my bikes for years with no problems. They all work fine.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291373 12/11/19 10:45 AM
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toneydoc Offline
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For shorter OCI, I would buy any name brand oil that was on sale and put it to use


1994 Jeep 167k NextGen 10w30
2014 Camry 43k Castrol Magnatec 0w20
2018 Jeep Cherokee 7k Pennzoil Platinum 5w30
2014 HD Ultra 51k Mobil1 15w50
Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291390 12/11/19 10:58 AM
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ad244 Offline
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Rotella T4 or T5

Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291404 12/11/19 11:03 AM
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krismoriah72 Offline
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Originally Posted by kmrcstintn
I am seeking feedback on what folks feel is the 'best' conventional 10w-40 pcmo for use wet clutch bikes...before someone tells me to spend the 'extra few bucks' on motorcycle oil I wanna let it be known that I do shorter OCI's deliberately to reduce shearing; those 'extra few bucks' add up! I also want to use 10w-40(vs 15w-40 hdeo) for better flow during cool temps...


The cheapest 10w40 that i know of is Supertech at $3.12/qt but you asked for the 'best conventional """"" for use in wet clutch bikes" but you also want to save 'extra bucks'.. so i am going to go out on a limb here and say Valvoline 4 Stroke ATV.

Its $4.54 a quart https://www.walmart.com/ip/Valvolin...514362?variantFieldId=multipack_quantity
And has all the specs you need.

Regular Valvoline White Bottle 10w40 is $6 a quart so i think its a bargain.

Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291440 12/11/19 11:33 AM
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jeff78 Offline
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Originally Posted by kmrcstintn
I also want to use 10w-40(vs 15w-40 hdeo) for better flow during cool temps...


What are 'cool temps' for you? Unless you are starting your engine at subzero temps, there's very little difference between 10w-40 and 15w-40.

Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291508 12/11/19 12:32 PM
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jhellwig Offline
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Biggest thing to look for is that there is not any mention on “energy conserving”. In the api doughnut or on the label.


Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2014 Toyota Sienna
1983 Chevy K5 350
Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: ad244] #5291526 12/11/19 12:49 PM
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Dyusik Offline
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Originally Posted by ad244
Rotella T4 or T5

Or T6, all in 15w40.

Honestly, nothing a 15w40 can't handle temp wise that a rider can. Ran in the teens with no noticeable difference in startup and operation in a V twin. The R1 needs a little warm up with sub 5K RPM operation so the idiot light doesn't come on.

Last edited by Dyusik; 12/11/19 01:07 PM.

95 Cherokee 190K DELO XLE 10W30, XG8
04 YZF-R1 20K Frankenbrew 20w50ish, XG7317
14 RX450h 50k STP SYNHM 10w30, WIX 57047
18 RAM 3500 8k DELO SDE15w40, DBL7349
96 Cherokee
Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291534 12/11/19 12:58 PM
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Well my bike is different then yours, but here's what I use . I use 20/50 wt in the motor, and I ride all winter. You'll never have a problem starting as long as your battery is hot. I keep mine on a tender whenever it's in the garage. I use Rotella t triple protection 15/40 in the primary(clutch) and it shifts fine all thru the oci. I'm sure 10w40 wt would work just as well, but I use the 15/40 for other machines so it's always on hand. I use 75/90 wt gear oil in the trans all year round and it keeps the trans quite and shifts smooth, I've used these wt oils since I got the bike, and it's getting close to 75k miles. Find a brand you like that's easy to get and in your price range and stick with it. Every brand out there claims to be the best, buying what works for you saves, time and money and disappointment when you realize every oil doesn't work the best in every vehicle.,,,

Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291556 12/11/19 01:17 PM
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Any 10w40 auto oil will work so I d go with the cheapest.
Wet clutches really just need to stay wet to work.
I be tried a bunch of different oils, including ATF in a two strokes transmission without issues.
Gear oil doesn't work, but any motor oil or any ATF was fine.



2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: toneydoc] #5291622 12/11/19 02:48 PM
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Brian553 Offline
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Originally Posted by toneydoc
For shorter OCI, I would buy any name brand oil that was on sale and put it to use


+1; they'll all be too similar in performance. You need a thick base oil to run with the gearbox on a shared sump bike. This is a difference in PCMO 10w-40s and MC 10w-40 blends.

If you're gonna do PCMO, do 20w-50 for that reason.
If you don't, then do something rated for a gearbox spec.
There are some 15w-40s that are close to a 10w-40, and the cost difference is minimal--I am of the belief that it would bring the risk of fretting fatigue down much further.

Last edited by Brian553; 12/11/19 02:50 PM.

Delvac 1300........Valvoline Maxlife FS ATF........Liquid Wrench
Mobil 1 HM..........Valvoline Asian AF..................Berryman's B12



Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291687 12/11/19 04:20 PM
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Always used Rotella in my 1500 Goldwing and never had any wet clutch issues.


Don't waste your time on a slipshod repair.
Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5291792 12/11/19 07:08 PM
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There is a growing consensus among high mileage owners that either a motorcycle specific or PCMO oil will meet and exceed your mileage expectations...

Here are two easy to find 40 grades with similar additives... the biggest difference as you noted is cost... $12.00 Amsoil versus $4.57 Mobil...

[Linked Image]


Larry L
Have a Wheelie NICE day
94 RC45 #2 58,000 on 30 Grade, Currently Mobil 1 5W30 SN
2002 Camaro Mobil 1 5W30
1952 De Havilland Chipmunk



Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: krismoriah72] #5291985 12/11/19 11:14 PM
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Yep, just get Valvoline 10W-40 4-stroke motorcycle oil at Walmart for ~$4.50 a qt. Meets JASO MA motorcycle wet clutch specs. Lots of guys like this oil. Motorcycles don't hold 8 qts of oil, so how's i going to break the bank at $4.50/qt ... ??

Re: 'best' conventional 10w-40 pcmo for wet clutch bike [Re: kmrcstintn] #5292106 12/12/19 06:30 AM
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FastGame Offline
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MAG 1 4T is $ 4.00 qt , made by the same company that makes the new SuperTech 4T that cost $ 8.00 qt.

Last edited by FastGame; 12/12/19 06:31 AM.
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