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'86 Mercury 45 (Classic 50) lower unit oil... #5414839 04/27/20 05:05 PM
Joined: Apr 2007
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dblshock Offline OP
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Didn't feel like shopping so I drained then filled with Mobil1 75/90 LS GF-5 gear oil. Wondering if it's ok
the almost empty 'Marine' tube I had read 80/90 GF-5 so I figure it's pretty darn close.


Last edited by dblshock; 04/27/20 05:05 PM.

05 Lexus GX470 175k
640:1 TCW-3
M1 0W40 XG-3614
Toyo Open Country H/T II

06 4Runner SR5 155k
640:1 TCW-3
M1 0W40 XG-3614
Falken Wildpeak AT3W
Re: '86 Mercury 45 (Classic 50) lower unit oil... [Re: dblshock] #5414869 04/27/20 05:42 PM
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CT8 Offline
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It is not a bad idea to change the oil often.


2015 F150 2.7
2018 F350 6.2
Re: '86 Mercury 45 (Classic 50) lower unit oil... [Re: dblshock] #5414883 04/27/20 06:06 PM
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dblshock Offline OP
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been 4-5 yrs since I did that, oil came out black..don't fish like I used to just leave her tied on the dock all year.. I've owned this since new 34yrs.

[Linked Image]


05 Lexus GX470 175k
640:1 TCW-3
M1 0W40 XG-3614
Toyo Open Country H/T II

06 4Runner SR5 155k
640:1 TCW-3
M1 0W40 XG-3614
Falken Wildpeak AT3W
Re: '86 Mercury 45 (Classic 50) lower unit oil... [Re: dblshock] #5414928 04/27/20 06:45 PM
Joined: Mar 2007
Posts: 1,035
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hemitom Offline
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That gear lube should be fine.

If the lower unit sits in the water all summer you should be draining and refilling with fresh gear lube when you pull it out for the winter.


2009 Saturn Vue.
2015 Mustang GT Convertible.
Re: '86 Mercury 45 (Classic 50) lower unit oil... [Re: dblshock] #5415046 04/27/20 08:56 PM
Joined: Nov 2009
Posts: 1,197
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nwjones18 Offline
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Should be fine. I've always run the lower unit lube just because it claims to have an additive in it to help disperse the water, but not sure how necessary it is.


2016 Ram 1500 5.7 Hemi 30k QSUD 5w-20 Mopar filter
2008 Honda CRV 125K QSUD 5w-20 Fram ultra
2007 Mazda 3 2.3 130k 5w-30 syn-blend Denso filter
1988 F-150. 4.9 I6 251k. 10w-40 QSHM Motorcraft FL1A

Re: '86 Mercury 45 (Classic 50) lower unit oil... [Re: dblshock] #5415063 04/27/20 09:08 PM
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dblshock Offline OP
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lower unit is tite, oil came out black but no water. never had a lower unit issue and I've operated all the way into frigid ice breaking...i do have a head scratching problem with water fouling the inboard fuel, seems if it gets loaded with rain the tank will take on a quart or so of water but not always...sometimes I'll start and run as I pump maybe that is the problem once a vacuum is established...it's all under the 34yr. old deck and I dread the thought of going there....the joys of owning a old tub.


05 Lexus GX470 175k
640:1 TCW-3
M1 0W40 XG-3614
Toyo Open Country H/T II

06 4Runner SR5 155k
640:1 TCW-3
M1 0W40 XG-3614
Falken Wildpeak AT3W
Re: '86 Mercury 45 (Classic 50) lower unit oil... [Re: dblshock] #5415130 04/27/20 10:10 PM
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dblshock Offline OP
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So, the fouled fuel issue...I'm going to solve it without fixing the actual problem under the old deck...bought a automatic bilge and a solar trickle charger that
I can stow when running...presto!... no water build up, no fouled fuel..love a old tub plan.


05 Lexus GX470 175k
640:1 TCW-3
M1 0W40 XG-3614
Toyo Open Country H/T II

06 4Runner SR5 155k
640:1 TCW-3
M1 0W40 XG-3614
Falken Wildpeak AT3W
Re: '86 Mercury 45 (Classic 50) lower unit oil... [Re: dblshock] #5426016 05/11/20 05:43 AM
Joined: Jan 2011
Posts: 3,970
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Lubener Offline
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Myself, I would change out the lube every fall after the boating season ends.


The "thinking" man's friend.
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