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#2656912 - 06/17/12 04:31 PM Re: alternative to volvo penta 75w-90 full synthetic? [Re: Gillsy]
monster1 Offline


Registered: 01/31/10
Posts: 35
Loc: ca
Originally Posted By: Gillsy
Originally Posted By: cchase
My Volvo SX manual specifically, by name recommends Mobil 1 75w90 if the Volvo Penta fluid is unavailable.

I've used Mobil 1 75w90 in my SX for five years. No worries!


Would that be the full synthetic ls (limited slip) formula?

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#2656914 - 06/17/12 04:33 PM Re: alternative to volvo penta 75w-90 full synthetic? [Re: monster1]
cchase Offline


Registered: 11/03/09
Posts: 4004
Loc: New England
Originally Posted By: monster1
Originally Posted By: cchase
My Volvo SX manual specifically, by name recommends Mobil 1 75w90 if the Volvo Penta fluid is unavailable.


Is that out of your genuine volvo penta owners manual? My 2004 owners manual does not give an alternative recommmendation for the gear lube outside of the vp gear lube. However, my clymer repair manual does. It says to use mobilube shv if the vp gear lube is not avalible. What year os your outdrive?


My outdrive is a 1995 model. Things may have changed since then, but I'm not sure why/how.

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#2662100 - 06/22/12 05:30 PM Re: alternative to volvo penta 75w-90 full synthetic? [Re: monster1]
lars11 Offline


Registered: 12/16/06
Posts: 786
Loc: Sweden
No, exactly like this: Mobilube SHC fully synthetic sae 75w90. Don't think that's LS. The drive has a cone clutch, you don't want that to slip=heat.

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#2681499 - 07/12/12 08:19 AM Re: alternative to volvo penta 75w-90 full synthetic? [Re: lars11]
cchase Offline


Registered: 11/03/09
Posts: 4004
Loc: New England
Originally Posted By: lars11
No, exactly like this: Mobilube SHC fully synthetic sae 75w90. Don't think that's LS. The drive has a cone clutch, you don't want that to slip=heat.


Lars, you are correct that the manual recommends Mobil 1 SHC 75w90 and not Mobil 1 LS 75w90. I did not read this thread well enough to notice that the debate was over LS or SHC, just whether M1 gear lube was recommended. Either way, I'm not sure if the LS would cause any issues - simply because I don't think they put very much FM in the LS fluid over the SHC fluid. In my experience, no LS diff is happy with the Mobil 1 LS fluid, which leads me to believe there isn't enough FM in there to bother with the clutches in the SX, but that's speculation and no more.

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#2681799 - 07/12/12 02:01 PM Re: alternative to volvo penta 75w-90 full synthetic? [Re: cchase]
lars11 Offline


Registered: 12/16/06
Posts: 786
Loc: Sweden
well, maybe it will work. However, this is one application where I wouldnt try to outsmart the manual at all. Note Volvo's intensity in recommending only Volvo OR SHC and nothing else.
In the steering servo or engine, Volvo recommends its own (of course) or "any dexron" or in the engine API SH... quite open recommendation, right?
But in the drive, ONLY Volvo full synth OR the Mobil SHC. That's no joke.

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#2682807 - 07/13/12 12:45 PM Re: alternative to volvo penta 75w-90 full synthetic? [Re: cchase]
QuadDriver Offline


Registered: 10/25/02
Posts: 712
Loc: Pennsylvania
ditto
_________________________
If you want something done fast....
...increase the voltage. But dont lick the black wire...

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#2683376 - 07/13/12 10:29 PM Re: alternative to volvo penta 75w-90 full synthetic? [Re: lars11]
monster1 Offline


Registered: 01/31/10
Posts: 35
Loc: ca
Originally Posted By: lars11
well, maybe it will work. However, this is one application where I wouldnt try to outsmart the manual at all. Note Volvo's intensity in recommending only Volvo OR SHC and nothing else.
In the steering servo or engine, Volvo recommends its own (of course) or "any dexron" or in the engine API SH... quite open recommendation, right?
But in the drive, ONLY Volvo full synth OR the Mobil SHC. That's no joke.




I thought about it and realized that the 30 dollars in yearly savings of using mobil 1 just isn't justifable when it would cost several thousand to rebuild the drive if i'm wrong.

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#2683856 - 07/14/12 03:38 PM Re: alternative to volvo penta 75w-90 full synthetic? [Re: lars11]
cchase Offline


Registered: 11/03/09
Posts: 4004
Loc: New England
Originally Posted By: lars11
well, maybe it will work. However, this is one application where I wouldnt try to outsmart the manual at all. Note Volvo's intensity in recommending only Volvo OR SHC and nothing else.
In the steering servo or engine, Volvo recommends its own (of course) or "any dexron" or in the engine API SH... quite open recommendation, right?
But in the drive, ONLY Volvo full synth OR the Mobil SHC. That's no joke.


I agree with you here. However, my manual is rather specific on engine oil, stating never to use a multi-viscosity oil, ONLY SAE 30. This seems about as backward as it gets, but who am I to question? Seems 75% of boaters ignore that advice.

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#2684676 - 07/15/12 02:24 PM Re: alternative to volvo penta 75w-90 full synthetic? [Re: monster1]
lars11 Offline


Registered: 12/16/06
Posts: 786
Loc: Sweden
no I agree with you cchase on engine oil.
But as I tried to state clearly, I don't think the fact that you can very well use many oil alternatives to run a chevy v8 proves that you can successfully use lots of alternatives in the modern cone clutch duoprop or single prop Pentas.
I use delvax mx 15w40 in my 5.0gi with identical oli pressure as the volvo mineral oil, volvo recommmends mineral 20w50 or straight 30 synthetic but also a very low sae s classification. I think it means "use stout, fairly hi visc oil, change it at 50 hrs, beware of fuel dilution"
In my manual, volvo's take on multi vis oils is to "ignore any multi vis recommendations stamped on the block or printed on the oil cap". I think that is to avoid using a truck or auto recommendation left printed on the engine parts.

But I suspect that for light use, most GL5 synth would work ok. I just don't try it myself. Only been boating with pentas since 1980 though. wink

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#2729085 - 08/29/12 07:20 PM Re: alternative to volvo penta 75w-90 full synthetic? [Re: lars11]
doyall Offline


Registered: 06/26/03
Posts: 417
Loc: LA (Lower Alabama)
Originally Posted By: lars11
No, exactly like this: Mobilube SHC fully synthetic sae 75w90. Don't think that's LS. The drive has a cone clutch, you don't want that to slip=heat.


Mobilube 1 SHC Fully Synthetic 75W-90 is no longer available under that name in the US. According to an email today from an ExxonMobil Marine Tech (by the name of Luc), "... [Mobil] Delvac Syn Gear 75W-90 is the modern replacement for the old SHC 75W-90."

The Delvac Full Synthetic lube is not near as pricey as the VP lube, or even Mobil 1 75W-90 for that matter unless you can find the M1 on sale.

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