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Old 10-24-2008, 06:08 PM   #1
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Sleipner bow thruster

In Fort Loudon TN. getting an indoctrination*to College Football with the TN/Alabama game*tomorrow!
I need to top up my Sleipner which requires EP90. Went to 4 auto stores (and an hour on the web) trying to find an equivalent, without success.
What will substitute for EP 90? (GL4? Hypoid?)

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Old 10-25-2008, 06:29 AM   #2
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RE: Sleipner bow thruster

90 Wt. lower unit oil for outboards?

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Old 10-25-2008, 09:40 PM   #3
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RE: Sleipner bow thruster

GL-4 seems to be the*best bet; according to a Castrol note, EP90 has been replaced by GL-4.* You may well end up with an 85W-90*just a slightly extended viscosity range.

Napa shows a StaLube GL-4 85W-90.

Don't go with a GL-5, even though it's supposed to "superceed" the GL-4.* Apparently some of its*additives*may be corrosive to ***some*** metals.* You may be OK, but probably would need to check with the mfr.

BTW:* "Hypoid"*means oils compatible with helical cut (as opposed to straight cut) gears.* These require oils that can handle*higher pressures - therefore the "extreme*pressure" or EP designation.* So EP, GL-4, GL-5 are all "hypoid" oils.

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Old 10-26-2008, 12:04 PM   #4
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RE: Sleipner bow thruster

Sidepower specifies GL5 for its bow thrusters.
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