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#3306712 - 03/10/14 02:41 AM Mixing syn 5w40 and dino 15w40
sixtwoturbo Offline


Registered: 01/28/14
Posts: 33
Loc: Abbotsford, BC
My van's rear main leaks, crank is worn down and I replaced the seal. Running dino 15w40 slows it down a ton but I can't stand how thick it is when its cold. Love running the 5w40 but I'll never have to worry about the underneath rusting, wink I have Rotella synthetic 5w40 and dino 15w40 so I was thinking mixing it 50/50 to help with the rear main leak and still have some synthetic for cold starts. Thoughts?


Edited by sixtwoturbo (03/10/14 02:41 AM)
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1984 G20 Get A Way van, 6.2 diesel with a remote mounted turbo-HX35 with a billet 60mm HX40 comp wheel, 20 psi, running waste fuels and jet fuel.

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#3306719 - 03/10/14 02:54 AM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
Garak Offline


Registered: 12/05/09
Posts: 20388
Loc: Regina, Saskatchewan, Canada
How does it fare with a 10w-30 conventional HDEO in it? I'm assuming it leaks a fair bit of that, too.
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2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Baldwin B1402
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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#3306745 - 03/10/14 04:08 AM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
Marco620 Offline


Registered: 02/25/14
Posts: 1324
Loc: Fly Over Region, North America
Many times I have recommended LM Motor Oil Saver and its reduced the leak. High mileage oils like pennzoil or valvoline maxlife might help. Tried White Shepard Leak Seal, and it fixed rear manifold gasket on 94 grandprix, but didnt do anything to the old cork gasket on tranny. Costs some coin but I think they still have a satisfaction guarantee. Good luck.
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#3306782 - 03/10/14 05:52 AM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
KD0AXS Offline


Registered: 11/13/12
Posts: 2205
Loc: Nowthen, MN
I'd probably go with a HM 10W-40. Probably no more expensive than your dino 15W-40, thinner when cold, may help slow the leak, and most HMs are syn blend.
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#3306787 - 03/10/14 06:09 AM Re: Mixing syn 5w40 and dino 15w40 [Re: KD0AXS]
KD0AXS Offline


Registered: 11/13/12
Posts: 2205
Loc: Nowthen, MN
Originally Posted By: KD0AXS
I'd probably go with a HM 10W-40. Probably no more expensive than your dino 15W-40, thinner when cold, may help slow the leak, and most HMs are syn blend.


Never mind this, guess I'm still half asleep this morning. Didn't realize we're talking about a diesel here.
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#3306805 - 03/10/14 06:52 AM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
A_Harman Offline


Registered: 10/01/10
Posts: 6199
Loc: Michigan
MaxLife 10w40 is CF rated, so it's good for IDI diesels built up to 1994. I say give it a try. All MaxLife oils are synthetic blends, and have a good reputation for slowing or stopping leaks. Plus, you'll definitely have a 10w40 oil instead of a maybe 10w40 oil.
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#3306842 - 03/10/14 07:47 AM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
Zaedock Offline


Registered: 09/10/05
Posts: 3918
Loc: Massachusetts
All I ever ran in my '83 6.2L stake bed was 15W40 or SAE30 Delo. Retired the truck with the motor running well at 478K miles. That included below freezing starts (many times not plugged in).
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#3306877 - 03/10/14 08:46 AM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
Chris142 Online   content


Registered: 06/05/03
Posts: 14767
Loc: apple valley, ca
10W30 dino diesel oil and dont worry so much
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#3306914 - 03/10/14 09:31 AM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
Papa Bear Offline


Registered: 08/11/05
Posts: 6591
Loc: Leamington, ON, Canada ..... r...
It doesn't get "THAT" cold in Abbotsford .. it's not Thompson MB !!

(a person from Abbotsford isn't allowed to join in a conversation about "Canadian Winter" in the mid-west cool )

If it doesn't start with 15W-40 in it the battery is likely suspect
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#3306926 - 03/10/14 09:41 AM Re: Mixing syn 5w40 and dino 15w40 [Re: Papa Bear]
Padawan Offline


Registered: 08/24/08
Posts: 266
Loc: NJ
I agree with Papa Bear. Looking at the weather forecast for your area, I would stay with 15W-40 rather than blending.

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#3307010 - 03/10/14 11:10 AM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
bullwinkle Online   confused


Registered: 10/09/04
Posts: 6304
Loc: Cincinnati, OH, USA
I'm running Bars Leak Rear Main Seal Repair in the 7.3 IDI seems to have slowed the rear main leak a little-is your CDR valve working? Wonder if they make a Speedi-Sleeve for your 6.2-that's what I'll eventually have to put on my 7.3 to stop it.
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#3307159 - 03/10/14 01:02 PM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
sixtwoturbo Offline


Registered: 01/28/14
Posts: 33
Loc: Abbotsford, BC
LOL, thanks guys. Your right, it doesn't get that cold but we do get freezing temps and I just don't like the sound, hehee.

Its a bugger to start on my fuels so it needs all the help it can get, I have new battery's and a starter and plug it in, plus I basically start it and hit the highway.

I could get a speedi sleeve but don't feel like pulling the engine, too much work plus a new engine is going in soon, aprox 6 months, found a GEP engine which has the one piece rear main seal. laugh

I am sqeamish running a 10w30 but if you guys feel its ok I'll try that.


Edited by sixtwoturbo (03/10/14 01:04 PM)
_________________________
1984 G20 Get A Way van, 6.2 diesel with a remote mounted turbo-HX35 with a billet 60mm HX40 comp wheel, 20 psi, running waste fuels and jet fuel.

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#3307314 - 03/10/14 02:56 PM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
A_Harman Offline


Registered: 10/01/10
Posts: 6199
Loc: Michigan
If the engine is coming out in 6 months, then it doesn't matter much. Just dump any decent 10w40 in it. How many miles can you run before adding a quart?


Edited by A_Harman (03/10/14 02:57 PM)
_________________________
1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck

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#3307811 - 03/10/14 11:00 PM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
Garak Offline


Registered: 12/05/09
Posts: 20388
Loc: Regina, Saskatchewan, Canada
Originally Posted By: sixtwoturbo
I am sqeamish running a 10w30 but if you guys feel its ok I'll try that.

My dad had a 6.2 of the same vintage as yours. He switched to 10w-30 in the fall every year. It lasted forever and a day; I wish the thing was still around.
_________________________
Plain, simple Garak.

2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Baldwin B1402
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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#3308279 - 03/11/14 12:44 PM Re: Mixing syn 5w40 and dino 15w40 [Re: sixtwoturbo]
sixtwoturbo Offline


Registered: 01/28/14
Posts: 33
Loc: Abbotsford, BC
Thanks guys. I have to add a quart about every 700-1000 km's, depending on how hard I drive.

I can't have it blow up yet, still building the other engine.
_________________________
1984 G20 Get A Way van, 6.2 diesel with a remote mounted turbo-HX35 with a billet 60mm HX40 comp wheel, 20 psi, running waste fuels and jet fuel.

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