Does my GL-5 75W90 need to be official?

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kd4pbs

Petty Officer 2nd Class
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Mar 5, 2012
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154
Well, not necessarily "official" since I have no idea what "unofficial" gear lube would be, but now that it has been run in the water, I discovered I need to replace the prop seals on this summer project. I'd really like to refrain from paying the exorbitant price VP asks for their oil, so I am curious if something decent like Mobil 1 GL-5 75W90 is acceptable. I seem to remember reading on here someplace that VP just re-badges Mobil 1, but I cannot find that post and wanted to run this by the experts first.
 
Horigan

Horigan

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I’ve read that VP oil does better with water contamination and is better for shifting…
 
Bondo

Bondo

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kd4pbs said:
Well, not necessarily "official" since I have no idea what "unofficial" gear lube would be, but now that it has been run in the water, I discovered I need to replace the prop seals on this summer project. I'd really like to refrain from paying the exorbitant price VP asks for their oil, so I am curious if something decent like Mobil 1 GL-5 75W90 is acceptable. I seem to remember reading on here someplace that VP just re-badges Mobil 1, but I cannot find that post and wanted to run this by the experts first.
Click to expand...
Ayuh,....... That's what I use,... full-synoil......
 
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dypcdiver

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740 hours in my DP-SM outdrive using Mobil 1 without problems, it used to be a recommendation in the manual but not now, however Mobil 1 is almost the same price as Volvo Penta. I buy it in 25 Ltr drum as it also goes in my Landcruiser and Rav4's gear boxes and axles.
 
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BRICH1260

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I`ve been told that Mobil 1 has limited slip additives. I believe VP suggests non limited slip additives because of the cone clutch. I run Amsoil gear oil as it has water absorbing abilities.
 
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kd4pbs

Petty Officer 2nd Class
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Mar 5, 2012
Messages
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Never have been a fan of Amsoil anything after a friend put Amsoil gear lube in the rear end of a truck I sold him and it puked a pinion bearing after a few hundred miles. I used Mobil 1 in it for it's whole life up to that point (180K miles).
I did find the old post I remembered reading a while ago...

https://forums.iboats.com/threads/volvopenta-outdrive-lube-issue-settled-for-me.557271/

The stuff to get today appears to be called, "Mobil Delvac Synthetic Gear Oil 75W-90". It's less than half the price of the VP branded stuff.

If VP specified it, I'm sold. Thanks!
 
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