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#4529807 - 09/29/17 08:36 PM 5w40 HDEO vs 20w50
sw99 Offline


Registered: 03/22/06
Posts: 2120
Loc: Colorado
Really considering a run of Delo LE 5w40 in my 11' FLTRX. I do yearly OCI's anyway and CO gets cool at times. Most riding I do is 3500 miles in a 12 month period so I really think this will hold up fine. Anyone else here run the thinner HDEO in their v-twins?
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#4529809 - 09/29/17 08:39 PM Re: 5w40 HDEO vs 20w50 [Re: sw99]
Reddy45 Offline


Registered: 08/15/08
Posts: 2968
Loc: USA
That's an air cooled engine right?

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#4529845 - 09/29/17 09:18 PM Re: 5w40 HDEO vs 20w50 [Re: sw99]
sw99 Offline


Registered: 03/22/06
Posts: 2120
Loc: Colorado
Yes, they get warm I know... A full syn 5w40 should still be plenty stout IMO.
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#4529869 - 09/29/17 09:55 PM Re: 5w40 HDEO vs 20w50 [Re: sw99]
blupupher Offline


Registered: 08/27/04
Posts: 4421
Loc: Katy, Republic of Texas
Does Delo 5w-40 "thin out" and shear like some complaints I have read about the Rotella T6 5w-40.
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1994 Honda VT1100C: Peak 15w-40/TG/2500 mile OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI


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#4529880 - 09/29/17 10:11 PM Re: 5w40 HDEO vs 20w50 [Re: blupupher]
Robenstein Offline


Registered: 12/23/09
Posts: 5653
Loc: Central IA
Originally Posted By: blupupher
Does Delo 5w-40 "thin out" and shear like some complaints I have read about the Rotella T6 5w-40.


It is a Harley so no shared sump to tear up the oil.
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#4529882 - 09/29/17 10:13 PM Re: 5w40 HDEO vs 20w50 [Re: sw99]
Robenstein Offline


Registered: 12/23/09
Posts: 5653
Loc: Central IA
I have seen the recent VOA's of the new spec diesel oils and they look unappealing to me with the exception of Rotella. I would probably look to something like Valvoline VR1, Kendall GT1, or Mobil 1 in a 20w50 (15w50 in the case of Mobil 1) flavor if you want a cheaper alternative to motorcycle oil.
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#4529885 - 09/29/17 10:16 PM Re: 5w40 HDEO vs 20w50 [Re: sw99]
BigCahuna Offline


Registered: 09/29/09
Posts: 2141
Loc: Deep in the heart of Jersey
Harley says to use 10/40 when the temp is under 40f. A 5/ 40 wt wt might be a bit to thin to use year round. Lowest I would go is 15/40 for cold weather use only. A 15/50 would be closer to what Harley recommends for year round use.,,

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#4530012 - 09/30/17 07:27 AM Re: 5w40 HDEO vs 20w50 [Re: sw99]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2380
Loc: Balearic Islands , Spain
I would run M1 V-TWIN 20W-50
Dino 20W-50 is good down to just below freezing, so a synthetic one should be just fine if you only start it up in above freezing temps.
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#4530015 - 09/30/17 07:34 AM Re: 5w40 HDEO vs 20w50 [Re: sw99]
alarmguy Offline


Registered: 07/10/12
Posts: 2152
Loc: South Carolina
Originally Posted By: sw99
Really considering a run of Delo LE 5w40 in my 11' FLTRX. I do yearly OCI's anyway and CO gets cool at times. Most riding I do is 3500 miles in a 12 month period so I really think this will hold up fine. Anyone else here run the thinner HDEO in their v-twins?


I wouldnt do it. 5/40 a bit thin, unless you ride in 80 degree and under temps full time.
I think if you wanted an HEDO then the conventional 15/40 is a far better choice actually might even be preferrable for 75 degree and lower riding temps and can easily handle going up to 5000 miles over a years time.

Anything else and its 15/50 or 20/50.
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#4530017 - 09/30/17 07:36 AM Re: 5w40 HDEO vs 20w50 [Re: Robenstein]
alarmguy Offline


Registered: 07/10/12
Posts: 2152
Loc: South Carolina
Originally Posted By: Robenstein
I have seen the recent VOA's of the new spec diesel oils and they look unappealing to me with the exception of Rotella. ...


Add to the list Valvoline Premium Blue Diesel oil, same deal they didnt slash the phos and zinc like some others have.
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#4530085 - 09/30/17 09:32 AM Re: 5w40 HDEO vs 20w50 [Re: sw99]
vintageant Offline


Registered: 10/27/06
Posts: 427
Loc: Florida, USA
Why not 15W40 HDEO?
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1925 Alvis HDEO 15W40
1937 Alvis Speed 25 20W50 w LM MoS2 & LM MOS
1970 VW Peking - Paris Rally Beetle HDEO 15W40 w LM MoS2
1987 Porsche 924S HDEO 15W40

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#4530142 - 09/30/17 10:44 AM Re: 5w40 HDEO vs 20w50 [Re: sw99]
Silverado12 Online   content


Registered: 02/26/13
Posts: 3114
Loc: Central Virginia
I wouldn't use anything but 20W-50. I tried 15W-40 diesel oil in the winter (for the occasional warm day so the bike would be easier to start) and I could hear the engine making more noise than usual in the top end after about 700 miles. FWIW I'm using Valvoline VR1 20W-50 and changing once a year.
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#4530202 - 09/30/17 12:02 PM Re: 5w40 HDEO vs 20w50 [Re: sw99]
benjy Offline


Registered: 08/23/10
Posts: 866
Loc: pa
for a good cheap oil Mystic's 15-50 Diesel is hard to beat. my sportster would not start with amsoil 20-50 in the winter, stored indoors unheated, 10-40 cured that, a 15W would prolly do ok. Mystic is blended by Citgo who blended HD oils. a 5-40 would be good for the coldest riding most anyone would do + prolly hold up in colder weather

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#4530321 - 09/30/17 02:26 PM Re: 5w40 HDEO vs 20w50 [Re: sw99]
Kamele0N Online   sick


Registered: 02/09/15
Posts: 2041
Loc: Slovenia
https://mobiloil.com/~/media/amer/us/pvl/files/pdfs/mobil-1-oil-product-specs-guide.pdf
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#4530611 - 09/30/17 08:42 PM Re: 5w40 HDEO vs 20w50 [Re: sw99]
sw99 Offline


Registered: 03/22/06
Posts: 2120
Loc: Colorado
I usually use the Quicksilver (Mercury) from WM @ $25 and it's full synthetic. I just have a hard time believing that a full syn 5w40 HDEO is not capable of the task of the air cooled v-twin. We do have several 90*+ days during the summer so I certainly dont want to do any harm.
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2018 Subaru Outback 2.5i
2018 Ford F350 6.2L


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