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Lower drive unit oil (non-Volvo)
Posted: Tue Jan 20, 2015 9:10 pm
by jhnmdahl
The service manual for my 5.7L penta says to refill with fresh GL-5 synthetic gear lubricant or mobilube 1 shc 75w-90 (meeting or exceeding MIL-L-2105C or D, API GL-4 or GL-5). While Mobil 1 75w-90 meets GL5, the Mobilube was a similar full synthetic with no limited slip additive - now replaced by Mobil Delvac Synthetic 75w-90.
Looks like I'll use the Mobil Delvac Synthetic 75w-90 for the first lower unit change.
Re: Lower drive unit oil (non-Volvo)
Posted: Wed May 18, 2016 8:30 pm
by Big Block Power
Have you had the boat out with this oil yet. Mine won't need changing till the end of the year but that's prob the lube I would switch too ofc I don't go Volvo. It Doesnt sound like the drive is too fussy on this lube.
Re: Lower drive unit oil (non-Volvo)
Posted: Thu May 19, 2016 11:43 am
by jhnmdahl
Yep, I can't say I notice any difference though. Mobil oils have a pretty impeccable reputation, and I like being able to use parts and materials that I can find most anywhere.
Re: Lower drive unit oil (non-Volvo)
Posted: Thu May 19, 2016 9:08 pm
by Big Block Power
That's what I wanted to know. Can't go wrong with any Mobil product for sure.
Re: Lower drive unit oil (non-Volvo)
Posted: Sat Oct 07, 2017 4:53 pm
by Big Block Power
I'm going to switch over to BG gear lube this year. I'll report on it next spring. My rep put it in his Merc Alpha drive and it took the clunk out of it. He had a merc tech drive his boat and he couldn't believe how it shifted. My forward is really Smooth but reverse not as nice. My 222 is smooth in both directions. Also I'm going to change this oring on the drain bolt. #15