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Best 10W-30 synthetic for air cooled Kohler #4538641
10/09/17 11:38 PM
10/09/17 11:38 PM
Joined: May 2008
Posts: 214
Va
i6pwr Offline OP
i6pwr  Offline OP
Joined: May 2008
Posts: 214
Va
I had a similar thread a long ways back, but this is more specific. I have access to Redline, Amsoil, as well as the M1 and other easily avail oils.

I rebuilt this 12HP K301 a little ways back and I would like to ask what the best 10W-30 Synthetic oil I can put in it, I know some will be splitting hairs.

I'm not well versed on base stocks and additives for flat tapped lifters and cams, splash-lube & air cooling which is why I ask.

I also have few powersports dealers near me so many of those oils are readily avail also.

This motor was rebuilt with the Mahle forged piston with a piston to bore clearance of .0048", not the standard cast with a .007" clearance, so I've been leary on the 15w-40. I wish there was a full synthetic 15W-40.

I was thinking on the Redline 30W race oil, but curious to the words of wisdom. I've been using Rotella 10W-30 for the engines first 75 or so hours and would like to go to full synthetic.

I'm not too concerned with the cost as the price difference will be negligible, just want the best for this motor.

Thank you for any tips and advice.

Last edited by i6pwr; 10/09/17 11:39 PM.
Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538651
10/10/17 12:48 AM
10/10/17 12:48 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
SAE 30 might be better for that application. I'm seriously entertaining the thought of running it in my car.

Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538681
10/10/17 04:07 AM
10/10/17 04:07 AM
Joined: Jun 2008
Posts: 272
Minnesota
bmod305 Offline
bmod305  Offline
Joined: Jun 2008
Posts: 272
Minnesota
I wouldn't use straight 30. Kohler factory recommended viscosity is 10w-30. Some Kohlers had hydraulic lifters (Command Series it is required) so the 10w-30 is recommended. I know your K301 is old style with a basic solid cam follower lifter. I would use Amsoil 10W-30 Small Engine oil.

Dave

Last edited by bmod305; 10/10/17 04:10 AM.
Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538685
10/10/17 04:19 AM
10/10/17 04:19 AM
Joined: Dec 2004
Posts: 1,549
Pennsylvania
Slick17601 Offline
Slick17601  Offline
Joined: Dec 2004
Posts: 1,549
Pennsylvania
Mobil 1 HM is a great choice.


2018 Ram Bighorn 5.7
2008 Toyota Sienna 3.5
Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538688
10/10/17 04:25 AM
10/10/17 04:25 AM
Joined: Jan 2009
Posts: 2,471
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,471
wi
Amsoil ASE or ACD I like both.

Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538692
10/10/17 04:32 AM
10/10/17 04:32 AM
Joined: Dec 2006
Posts: 4,220
Port Orange, Florida
Panzerman Offline
Panzerman  Offline
Joined: Dec 2006
Posts: 4,220
Port Orange, Florida
They do make a 5w40 full synthetic as well as a 10w30 for diesel engines that would be more robust for your application. I would stick with a diesel oil that resists burn off better than car oils.



2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538695
10/10/17 04:39 AM
10/10/17 04:39 AM
Joined: Mar 2013
Posts: 5,034
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,034
The Midwest
You should use something that contains a proven anti wear not found in many oils. Titanium.
Kendall GT-1 Max with liquid titanium 10W30 fits the bill.
The boutique oils won't extend engine life just because that put in more zinc.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Best 10W-30 synthetic for air cooled Kohler [Re: skyactiv] #4538719
10/10/17 05:29 AM
10/10/17 05:29 AM
Joined: Jan 2009
Posts: 2,471
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,471
wi
Originally Posted By: skyactiv
You should use something that contains a proven anti wear not found in many oils. Titanium.
Kendall GT-1 Max with liquid titanium 10W30 fits the bill.
The boutique oils won't extend engine life just because that put in more zinc.
Seriously what the

Re: Best 10W-30 synthetic for air cooled Kohler [Re: skyactiv] #4538720
10/10/17 05:29 AM
10/10/17 05:29 AM
Joined: Jan 2009
Posts: 2,471
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,471
wi
Originally Posted By: skyactiv
You should use something that contains a proven anti wear not found in many oils. Titanium.
Kendall GT-1 Max with liquid titanium 10W30 fits the bill.
The boutique oils won't extend engine life just because that put in more zinc.
Seriously what the

Re: Best 10W-30 synthetic for air cooled Kohler [Re: dave123] #4538750
10/10/17 05:57 AM
10/10/17 05:57 AM
Joined: Mar 2013
Posts: 5,034
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,034
The Midwest
Originally Posted By: dave123
Originally Posted By: skyactiv
You should use something that contains a proven anti wear not found in many oils. Titanium.
Kendall GT-1 Max with liquid titanium 10W30 fits the bill.
The boutique oils won't extend engine life just because that put in more zinc.
Seriously what the


I wonder about myself sometimes


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538762
10/10/17 06:07 AM
10/10/17 06:07 AM
Joined: Mar 2004
Posts: 21,115
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 21,115
Upstate NY
Amsoil 4-Stroke oil for small engines.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538797
10/10/17 06:45 AM
10/10/17 06:45 AM
Joined: Dec 2003
Posts: 9,926
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,926
Florida, Cape Coral
T5 ROTELLA 10w30 from Shell. A very stout blend with diesel rating. Ed


CX5 Touring 2.5L :-)
Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538843
10/10/17 07:52 AM
10/10/17 07:52 AM
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
Ive had super luck with 10w30 V1R racing synthetic Valvoline with a 1/2 jigger of Liqui-Moly in my generator. NOTHING else kept her purring and quiet after 3 hours in the summer after a microburst took down our overhead power lines.
Rotella I didn't like T5 in the snow blower, preferred Triple Protect dino.

I would not use Liqui-Moly if the unit has an oil filter due to possible agglomeration, clogging issues.


2014 Nissan Rogue S CVT, OC#10 47272mi-QSUD10W30+5w20 Toughguard Filter; '17 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: Best 10W-30 synthetic for air cooled Kohler [Re: Eddie] #4538850
10/10/17 07:59 AM
10/10/17 07:59 AM
Joined: Mar 2016
Posts: 1,013
PA,US
HemiHawk Offline
HemiHawk  Offline
Joined: Mar 2016
Posts: 1,013
PA,US
Originally Posted By: Eddie
T5 ROTELLA 10w30 from Shell. A very stout blend with diesel rating. Ed


after some research with my new cub, I also went with T5 10w30. Seems to work well in my 25 horse twin. Noticeably smoother than the break in oil that came out (but that might have happened with any decent 10w30).


2016 Nissan Frontier Pro4x
2017 VW GTI sport
1995 Mustang GTS
Re: Best 10W-30 synthetic for air cooled Kohler [Re: i6pwr] #4538859
10/10/17 08:07 AM
10/10/17 08:07 AM
Joined: Oct 2014
Posts: 12,578
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,578
Idaho
15W-40 HDEO


2015 Ford F150 2.7
2018 Ford F350 6.2
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