What Weight Oil in Engine and Diffs?
Moderator: kw573
-
- Sergeant Major of the Gee
- Posts: 466
- Joined: Thu Nov 24, 2005 2:10 pm
- Location: Florida
What Weight Oil in Engine and Diffs?
I'm getting ready to change my engine and diff oil. The book calls for straight 30 in my original 270 engine and 90 weight in the differentials. The engine has excellent compression and uses no oil. Any harm or is it a good thing to use 15/40 in the engine and 85/140 in the differentials?
-
- G-Lieutenant General
- Posts: 5638
- Joined: Thu Dec 03, 2009 5:29 pm
- Location:
Re: What Weight Oil in Engine and Diffs?
Hello,
I don't know about the specifics of oil.
Personally I would try to keep as close to original as possible. especially since your engine works perfect now.
I do know that you Never want to use a detergent type oil in an old engine, in particular CCKW/DUKW engines.
Ray
I don't know about the specifics of oil.
Personally I would try to keep as close to original as possible. especially since your engine works perfect now.
I do know that you Never want to use a detergent type oil in an old engine, in particular CCKW/DUKW engines.
Ray
-
- Sergeant Major of the Gee
- Posts: 466
- Joined: Thu Nov 24, 2005 2:10 pm
- Location: Florida
Re: What Weight Oil in Engine and Diffs?
Thanks for the replies. Someone else PM'd me with info and I think I'm going to stay with the 30 non-detergent and 90 weight as the book calls for.
-
- G-Sergeant
- Posts: 30
- Joined: Mon Jun 06, 2011 8:20 pm
- Location:
Re: What Weight Oil in Engine and Diffs?
15/40 Rotella is a fine replacement for SAE 30 in a vintage engine so long as the engine is not a sludged up mess. If you pull the rocker cover and there is any sludge buildup, do not use a detergent oil until you get rid of that sludge. If you use a detergent oil in a sludged engine, the detergent works on the sludge (good) but the oil filter traps it (good - except too much sludge clogs the oil filter - very bad). Use of a detergent oil in a new rebuilt 'old' engine isn't a problem at all.
A straight mineral oil should be used in vintage transmissions and transfer cases with straight cut spur gears. The detergent additive tends to foam with the agitation that comes with straight cut spur gears in old truck (and jeep) transmissions and transfer cases. This manifests as oil being pushed up through the shift cane joint. Use of detergent oil in hypoid differentials is fine - caution should be used for double reduction differentials in heavy trucks. That said, foaming from gear agitation is a problem that shows up only at sustained high speed. If your truck is used only for parades and is trailered to the parade, or runs on surface streets to the parade/event, use of a detergent oil in gearboxes is just fine.
A straight mineral oil should be used in vintage transmissions and transfer cases with straight cut spur gears. The detergent additive tends to foam with the agitation that comes with straight cut spur gears in old truck (and jeep) transmissions and transfer cases. This manifests as oil being pushed up through the shift cane joint. Use of detergent oil in hypoid differentials is fine - caution should be used for double reduction differentials in heavy trucks. That said, foaming from gear agitation is a problem that shows up only at sustained high speed. If your truck is used only for parades and is trailered to the parade, or runs on surface streets to the parade/event, use of a detergent oil in gearboxes is just fine.
1944 Navy Sterling 115DD
1944 Converto T6, property tag ID CV38 Shangri-La
1944 Converto T6, property tag ID CV38 Shangri-La
-
- G-Sergeant
- Posts: 30
- Joined: Mon Jun 06, 2011 8:20 pm
- Location:
Re: What Weight Oil in Engine and Diffs?
Neglected to clarify - 'straight mineral oil' has no additives, and no detergent. When I need straight mineral gear oil, I visit the local oil distributor.
1944 Navy Sterling 115DD
1944 Converto T6, property tag ID CV38 Shangri-La
1944 Converto T6, property tag ID CV38 Shangri-La
-
- G-First Lieutenant
- Posts: 615
- Joined: Fri Jan 30, 2004 9:49 am
- Location: Pembroke NH USA
- Contact:
Re: What Weight Oil in Engine and Diffs?
And don't forget to add the Zinc if you use modern motor oil. They took the zinc out for 'pollution' reasons. Solid lifters that slide on a cam lobe should have it as I am told.
Stephen Keith AKA Dr Deuce
www.ww2movievehicles,com
9 CCKWs 6x6
7 Chevys 4x4
www.ww2movievehicles,com
9 CCKWs 6x6
7 Chevys 4x4
-
- G-Sergeant
- Posts: 30
- Joined: Mon Jun 06, 2011 8:20 pm
- Location:
Re: What Weight Oil in Engine and Diffs?
The product Camguard is recommended for piston aircraft engines - in particular for its corrosion inhibitors and additives to reduce cam lobe wear. I am not an employee, not a distributor and not connected to this company in any way. I am a member of the experimental aircraft association which is where I ran across this product.
https://aslcamguard.com/
https://aslcamguard.com/
1944 Navy Sterling 115DD
1944 Converto T6, property tag ID CV38 Shangri-La
1944 Converto T6, property tag ID CV38 Shangri-La
-
- Jeep Heaven
- Posts: 49841
- Joined: Sun Mar 02, 2008 12:37 pm
- Location: Proving Ground
Re: What Weight Oil in Engine and Diffs?
The OE use in WWII era tactical wheeled and tracked vehicles was Detergent. The information can be found in WWII Army Motors.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
Who is online
Users browsing this forum: No registered users and 32 guests