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Old 09-30-2021, 08:25 AM   #1
bigdog
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Default Mixing Stern Drive Lube viscosities ?

Just drained and refilled my Merc 4.3L sterndrive.
I bought 1 qt of Mercury SAE-90, but it was not enough. I can see this in the engine reservoir container, that it is about 4-6 oz, below the full line.

SAE90 is not cheap at $16 a quart. Question..... I have some 85W x 90 drive oil I used last year for a Outboard, can I add this to the current straight
SAE-90, without causing any issues ?

I'd buy another quart of SAE90 to add, but I'll be selling the boat in the Spring.

Thoughts?
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Old 09-30-2021, 08:27 AM   #2
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'The wrong oil is better than no oil'
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Old 09-30-2021, 10:27 AM   #3
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Walmart.com says the Gilford Walmart has quarts of Quiksilver high performance sae-90 gear lube for $9.97/qt ..... and probably has Super Tech 80w-90sae marine gear lube for $6.28 .... and the out-drive will never know the difference!

5-stars, 10/20/2019: "Good price and I like the color of the oil (SuperTech). Easy to see if you have any water in your oil." ..... BigDaddy
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Old 09-30-2021, 10:50 AM   #4
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I dont mix different weights. I dont even like mixing same weights of different brands. Buy the other quart at $16 and save the remainder for next year..............
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Old 09-30-2021, 01:30 PM   #5
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Yeah, don't do that, $16 is a lot cheaper than a lower end.
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Old 09-30-2021, 04:18 PM   #6
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Just to repeat... 'I'll be selling the boat in the Spring'.
Only need about 6oz to fill reservoir to full level.

Thanks !

Last edited by bigdog; 09-30-2021 at 04:18 PM. Reason: spell
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Old 09-30-2021, 04:40 PM   #7
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It's $16 to do it right. Add it to the price when you sell it.

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Old 09-30-2021, 06:29 PM   #8
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Quote:
Originally Posted by bigdog View Post
Just to repeat... 'I'll be selling the boat in the Spring'.
Only need about 6oz to fill reservoir to full level.

Thanks !
That sounds a little sleazy to me....
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Old 09-30-2021, 06:54 PM   #9
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Default Mixing Stern Drive Lube viscosities ?

Quote:
Originally Posted by ITD View Post
That sounds a little sleazy to me....

What would you do if you were keeping the boat?
Do the same for the next guy.

Its $16, Jeez…
I put a set of tires on a car once for my buyer.
$16?
Do you squeak when you walk?

BTW, thank you for the referral, Kevin!


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Old 09-30-2021, 07:28 PM   #10
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$16 is the price of a 4 pack of micro brewed beer. Why screw the next guy. I’d be embarrassed to say that.
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