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8V92 Detroit and Synthetic #4691627
03/11/18 02:26 PM
03/11/18 02:26 PM
Joined: Mar 2018
Posts: 2
tucson,az
moisheh Offline OP
moisheh  Offline OP
Joined: Mar 2018
Posts: 2
tucson,az
I am purchasing an RV with a 8v92 silver mechanical. Owner has been using Amsoil synthetic. I know this goes against Detroit's use of non synthetic 40 weight. But the unit is a high miler and runs great. I would like to switch to the recommended oil. Is there any problem in going back to a conventional CF2 4o wt. Detroits can use more than normal amounts of oil and I sure don't want to have that problem. Thanks

Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691650
03/11/18 02:53 PM
03/11/18 02:53 PM
Joined: Mar 2013
Posts: 5,045
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,045
The Midwest
It will be fine on conventional. I'm a semi mechanic and am a little too young to have worked on the old two-stroke Detroit's. I love the sound they make!
They supposedly consumed oil by design. Like a quart every 150 miles of operation when new. So forget the Amsoil and consider
buying a 55 gallon drum of oil and filling milk jugs to take with you for trips. I think those old engines spec a low ash oil, but I'm not sure.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691657
03/11/18 02:57 PM
03/11/18 02:57 PM
Joined: Mar 2013
Posts: 5,045
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,045
The Midwest


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691672
03/11/18 03:20 PM
03/11/18 03:20 PM
Joined: Dec 2016
Posts: 7,199
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,199
Waco, TX
I have worked for many years on Detroits - driven many miles with them, also.

All I have EVER used in them has been Rotella T1 (30 or 40)

I have never used 15W-40....ever.... but some people do and say it works fine. YMMV.

There are NOT "deigned to use oil" deliberately....
But by design, they do use oil - - - There's a difference.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691682
03/11/18 03:31 PM
03/11/18 03:31 PM
Joined: Dec 2006
Posts: 450
USA
AITG Offline
AITG  Offline
Joined: Dec 2006
Posts: 450
USA
I second the straight weight opinion. I ate a lot of square meals - and bought a lot of diapers - thanks to Detroit Diesel. The relatively small exhaust valves combined with the lack of valve stem seals would allow the build up carbon on the stem if you used the wrong oil. The valve would hang up a bit and then burn itself.

AFA burning oil: we always said "If there's oil in it, there's oil on it". The crankcase is pressurized. That makes it a great engine for off-road environments but the repeated heat and cool cycles eventually causes gaskets to harden. And leak. I could keep one dry for a 100,000 miles but after that they would mark their territory every time you shut it off.

Last edited by AITG; 03/11/18 03:33 PM.

The answer to 80% of BITOG questions: Read the book, follow directions.
Changing oil is not maintenance. Maintenance is the science of inspecting equipment to find and fix things before they break.
Re: 8V92 Detroit and Synthetic [Re: Linctex] #4691712
03/11/18 04:06 PM
03/11/18 04:06 PM
Joined: Mar 2015
Posts: 11,900
In the shop
53' Stude Offline
53' Stude  Offline
Joined: Mar 2015
Posts: 11,900
In the shop
Originally Posted By: Linctex
I have worked for many years on Detroits - driven many miles with them, also.

All I have EVER used in them has been Rotella T1 (30 or 40)

I have never used 15W-40....ever.... but some people do and say it works fine. YMMV.

There are NOT "deigned to use oil" deliberately....
But by design, they do use oil - - - There's a difference.


I lobe watching the ice road.trucker Joey barnes with his ancient fleet. Especially his "screaming ford"

https://youtu.be/eZ67oVw1HGU


09' Camry LE, 141,020 miles

PP 5w30 and TG 4967
Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691719
03/11/18 04:18 PM
03/11/18 04:18 PM
Joined: Oct 2014
Posts: 12,591
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,591
Idaho
there is absolutely no sound reason to run a syn oil in the 8V-92. They are really nice powerful engines. The 6V-92 and 8v-92 are decent engine lots of torque and in their time good mpgs. I have had plenty of Detroit 2 stroke diesel driving experience and I would never have one that is not turbo charged.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: 8V92 Detroit and Synthetic [Re: skyactiv] #4691724
03/11/18 04:25 PM
03/11/18 04:25 PM
Joined: Oct 2014
Posts: 12,591
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,591
Idaho
Originally Posted By: skyactiv
It will be fine on conventional. I'm a semi mechanic and am a little too young to have worked on the old two-stroke Detroit's. I love the sound they make!
They supposedly consumed oil by design. Like a quart every 150 miles of operation when new. So forget the Amsoil and consider
buying a 55 gallon drum of oil and filling milk jugs to take with you for trips. I think those old engines spec a low ash oil, but I'm not sure.
Other than the 92 series ,Detroit 2 stroke were only popular because they were low priced and easier to start in freezing weather. I wouldn't want on in a tractor unless I got it for free. I did lots of San Francisco Bay Area to Los Angeles Valley area turn arounds back in the day and they used about a gallon of oil per tank of fuel.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691725
03/11/18 04:25 PM
03/11/18 04:25 PM
Joined: Jul 2016
Posts: 1,703
Jacksonville, FL
FlyNavyP3 Offline
FlyNavyP3  Offline
Joined: Jul 2016
Posts: 1,703
Jacksonville, FL
I wouldn't bother with a synthetic on a Detroit 2 stroke even if it was allowed or advisable. They just consume too much oil for that. I've always run Delo 100 (not Delo 400) SAE 40. However I may start running the MileSyn SAE 40 that is sold by the 5 gallon bucket or 55 gallon drum that meets the MILSPEC and DD requirements. It's a fair bit less expensive than the Delo. Rotella T1 is right on the SA limit for the DD requirements so I avoid it.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691747
03/11/18 04:45 PM
03/11/18 04:45 PM
Joined: Oct 2010
Posts: 7,101
Michigan
A_Harman Offline
A_Harman  Offline
Joined: Oct 2010
Posts: 7,101
Michigan
Royal Purple does make synthetic monogrades formulated especially for Detroit Diesels if you're serious about spending a lot of money on oil.
But really, it isn't necessary. They ran forever on conventional monogrades. Some people never changed the oil in them, just kept them topped up and changed filters every once in a while.


1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck
Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691766
03/11/18 05:15 PM
03/11/18 05:15 PM
Joined: Aug 2011
Posts: 3,268
n.c.
gman2304 Offline
gman2304  Offline
Joined: Aug 2011
Posts: 3,268
n.c.
Will somebody please try to talk the OP out of buying a RV with a Detroit 8v92 ?

Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691788
03/11/18 05:42 PM
03/11/18 05:42 PM
Joined: Jun 2003
Posts: 17,839
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,839
Deplorable in apple valley, ca
We called them green leakers. There is some sort of box that is supposed to capture the oil and return it to the pan. When the box gets full the geysers start. The last couple years of the silver 92 had a sticker that said factory filled with 15w40 delo synthetic.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: 8V92 Detroit and Synthetic [Re: moisheh] #4691955
03/11/18 08:45 PM
03/11/18 08:45 PM
Joined: Dec 2006
Posts: 1,789
NY, NY
NYEngineer Offline
NYEngineer  Offline
Joined: Dec 2006
Posts: 1,789
NY, NY
I had a hospital call me once and ask me why their 16V-149 was eating oil like candy. I get there, pull the dipstick and feel the oil. I said let me see the drum that this oil came from. They walked me into their boiler plant up to a 55 gal drum of Black Bear compressor oil. I asked what on Earth made them think that was a good idea?
Needless to say, the next few hours of that day were spent getting the compressor oil out and getting 40 wt back in.

I'm still amazed that engine sustained no damage from that. To the OP, 40 wt Rotella will be fine. I also agree with gman2304. Why is this a good idea

Re: 8V92 Detroit and Synthetic [Re: moisheh] #4692093
03/12/18 04:34 AM
03/12/18 04:34 AM
Joined: Dec 2006
Posts: 4,220
Port Orange, Florida
Panzerman Offline
Panzerman  Offline
Joined: Dec 2006
Posts: 4,220
Port Orange, Florida
We owned alot of Detroit's and the 8v92 was my favorite. It will run forever on conventional 40 HD like another poster said. Synthetic is a waste of money. The really don't use the oil as much as slobber it. Don't be alarmed if it always marks it's spot. Typical Detroit trait. My dad loved them. Run them hard and the oil usage is less.
The like to be ran and not a good idling engine.
More they idle, more they slobber.
I d buy one in a minute just for the sound.

Last edited by Panzerman; 03/12/18 04:35 AM.


2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: 8V92 Detroit and Synthetic [Re: moisheh] #4692681
03/12/18 04:36 PM
03/12/18 04:36 PM
Joined: Mar 2009
Posts: 2,680
Cedarbrae, Ontario
xxch4osxx Offline
xxch4osxx  Offline
Joined: Mar 2009
Posts: 2,680
Cedarbrae, Ontario
I always loved the sound of the 12v71 Detroits. The "Buzzen Dozen" Those Detroits would take abuse and keep on going. The harder you ran them, the better they liked it it seemed. The used more fuel and leaked a lot of oil especially when they racked up the hours due to hardening of the gaskets I was told. Classic old diesel that had a sound of their own. Straight 40 weight in the summer and straight 30 weight in the winter is what I remember being used in them.


2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

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