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Penrite 10 Tenths for Mercruiser #4388136
04/24/17 09:34 PM
04/24/17 09:34 PM
Joined: Apr 2017
Posts: 50
Down Under
juggernaut Offline OP
juggernaut  Offline OP
Joined: Apr 2017
Posts: 50
Down Under
Fella's,

Whats your thoughts on using Penrite Racing 10 Tenths 15w/50 in a pair of 2006 8.1 Mercruisers (with oil coolers but no cats).

Specs are as follows:

Kinematic, cSt
at 40C 114
at 100C 17.5

VI 169

Ca 2960 PPM
Boron 630 PPM
Zn 1680 PPM
Phos assumed at 90% Zn 1,512 PPM

Noack 5

Base Number 9.8

HTHS 5.28cP

SN/CF A3/B3 rated and can be used in light duty petrol and diesel engines up to 2008 where A3/B4 is specified.

Claims to be shear free with no friction modifiers with POA and Esters.
Claims to be suitable for "normal" on road applications in a wide range of vehicles which suggests it would have a normal service life as also suggested by the base number and HTHS.

Suggests can be used where 15/40 or 20/40 oils are specified so it's closely in line with the Mercruiser spec'd 25/40 oil.

Currently using the Mercruiser 25/40 synth blend and previously the 25/40 mineral. In both cases the 8.1's start to use oil after about 20 hours and progressively gets worse (although with normal usage) until the next change. I'm assuming the oil is shearing and thinning over the year. Comments from other boaters indicate this oil shears to a 20w with nominal use.

I've read where others boaters has switched to Mobil 1 15/50 in these motors and consumption stops although reports also shows the 15/50 still does shears to a 30w.

Do approx 50 - 70 hours a year

Local temps don't go below 0 degrees C and up to 40 to 45 degrees C.

The oil is cheaper than Mobil 1 and Amsoil equivalents and also the Mercury 25/40. Yes the diesel/API rated oils from the majors are cheaper.

On paper this oil looks to be up to the task.

Thoughts, comments and advice welcome.

Last edited by juggernaut; 04/24/17 09:36 PM.
Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4388147
04/24/17 09:44 PM
04/24/17 09:44 PM
Joined: Sep 2010
Posts: 7,898
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,898
Texas
Looks up to the task - but suprised the Merc lube shears when one looks at what that stuff gets run in - Merc stays away from VII as well. In any case your choice supports that philosophy and carries a nice set of numbers.
Check your dipsticks for foaming after the first hard run - happy boating wink

Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4388155
04/24/17 09:57 PM
04/24/17 09:57 PM
Joined: Apr 2017
Posts: 50
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juggernaut Offline OP
juggernaut  Offline OP
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Posts: 50
Down Under
Cheers for the comments 4WD

Yes the Merc product data does suggest no VI so I can only assume the base oil isn't up to the task and/or there is fuel dilution. I've never been able to find specs on the Merc oil but there is speculation this is a blend of straight weight 25 and 40 in what proportion who knows - but assuming 50/50 would equate to 32.50 weight which is more or less in line with Mercs other recommendations of a 30 weight oil then a 40 weight oil depending on temps. Therefore, if it starts out as a 32.5 weight shearing to a 20w is is plausable.

Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4388406
04/25/17 07:48 AM
04/25/17 07:48 AM
Joined: Mar 2004
Posts: 21,363
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 21,363
Upstate NY
A UOA will tell you if it's shearing.

What about Rotella T or T6.

A boat engine is used more like a diesel engine, constant RPM hour after hour. Many boaters I know are using Rotella T.

Last edited by Donald; 04/25/17 07:49 AM.

2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4389066
04/26/17 12:44 AM
04/26/17 12:44 AM
Joined: Apr 2017
Posts: 50
Down Under
juggernaut Offline OP
juggernaut  Offline OP
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Posts: 50
Down Under
Donald,

Unfortunately, no Rotella T or T6 down under (Australia) we have Rimula versions instead and I'm not sure whether the composition is the same as the Rotella.

But I hear what you are saying, plan B was to look at diesel oils in the 15w/40 weight such as Delo 400 multigrade, Delvac 1300 super or Rimula. I would prefer a synthetic diesel oil but most seem to be less than a 15W and are generally thin 40 weights. I'm not sure I want to go much lower than 15W down here and Merc oil is 25W hence my original Penrite choice.


Last edited by juggernaut; 04/26/17 12:46 AM.
Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4389109
04/26/17 04:55 AM
04/26/17 04:55 AM
Joined: Dec 2002
Posts: 41,977
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 41,977
'Stralia
I reckon you could use the Racing 10W40...same basic premise.

Penrite, same add pack, shear free formula, robust HTHS, and if you need to thicken it, the 15W50 is totally compatible for the same reasons.

Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4389115
04/26/17 05:03 AM
04/26/17 05:03 AM
Joined: Dec 2002
Posts: 41,977
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 41,977
'Stralia
I reckon you could use the Racing 10W40...same basic premise.

Penrite, same add pack, shear free formula, robust HTHS, and if you need to thicken it, the 15W50 is totally compatible for the same reasons.

Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4390032
04/27/17 01:02 AM
04/27/17 01:02 AM
Joined: Apr 2017
Posts: 50
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juggernaut Offline OP
juggernaut  Offline OP
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Posts: 50
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Cheers for the suggestion Shannow

Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4390617
04/27/17 05:30 PM
04/27/17 05:30 PM
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Posts: 50
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juggernaut Offline OP
juggernaut  Offline OP
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Posts: 50
Down Under
FYI - here's the thread I found on the Mercruiser oil shearing to a 20 weight, whereas the HDEO's sheared to a 30 weight.

https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2416602

Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4405822
05/15/17 11:00 PM
05/15/17 11:00 PM
Joined: Sep 2015
Posts: 6,118
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
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Posts: 6,118
Kalifornia Kollective
I'd run 10/10ths any day in a marine application. No CATs, no worry smile

If it's warm enough to go boating, the 15W or 25W is entirely adequate for cold start smile

Last edited by BrocLuno; 05/15/17 11:02 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4415023
05/26/17 03:04 PM
05/26/17 03:04 PM
Joined: May 2012
Posts: 5,904
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,904
Fort Lauderdale, FL
Run Valvoline VR1. We put that in all of the high performance big blocks, and VR1 takes no guff from any of those engines. No shear, very low consumption.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4415186
05/26/17 07:52 PM
05/26/17 07:52 PM
Joined: Apr 2017
Posts: 50
Down Under
juggernaut Offline OP
juggernaut  Offline OP
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Posts: 50
Down Under
DoubleWasp - I'm assuming your talking about the 20w50 VR1, can only get the 10w/40 VR1 down under. The other alternative is 20w/50 Maxlife (red bottle).

Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4415578
05/27/17 01:23 PM
05/27/17 01:23 PM
Joined: Sep 2015
Posts: 6,118
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
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Posts: 6,118
Kalifornia Kollective
the Maxlife is a possible alternative. Depends on cam and lifters. Flat tappet cam I'd run 10/10ths or VR-1. 10W-40 would be fine if the motor has any reasonable bearing clearances ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4415971
05/28/17 12:30 AM
05/28/17 12:30 AM
Joined: Apr 2017
Posts: 50
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juggernaut Offline OP
juggernaut  Offline OP
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The 8.1 has a roller cam (basically a marinised GM 8.1 Vortec motor). Not sure I'm keen on a 10w40 given Merc specs 25w/40 oil. My local conditions also don't warrant a 10W oil.

My only concern with the 10 Tenths is whether it contains sufficient corrosion inhibitors as the boat lives on the water 24/7 - otherwise the specs look good.

Last edited by juggernaut; 05/28/17 12:31 AM.
Re: Penrite 10 Tenths for Mercruiser [Re: juggernaut] #4417408
05/29/17 04:26 PM
05/29/17 04:26 PM
Joined: Sep 2015
Posts: 6,118
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,118
Kalifornia Kollective
The inside of all engines that run periodically is completely covered in oil film. Even old dead marine engines that are sitting in the bone yard will be mostly rust free inside unless they get standing water in the actual engine ...

That corrosion inhibitor stuff is mostly marketing. Before the 1990's nobody talked about "extra" corrosion protection. I've never seen a marine engine rust from the inside, including ones that were sunk in salt water, brought up, flushed with diesel, re-oiled and fired up.

Raw water cooled in the ocean, sure. They loose water jackets and start pushing salt water into the motor. Have seen many exhaust manifolds eaten through. But the inside of a fresh water cooled or heat exchanger engine - nope.


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
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