SAE 90 vs SAE 80-90W

MO_CPA · 02-03-13, 12:18 PM

Hey guys

I run a 60 4stroke Mercury on my boat. Last year when I purchased the lower unit oil I bought the SAE 90 (my owners' manual is mute to which to buy SAE 90 vs SAE 80W-90). At any rate, I was browsing at Bass Pro last night and noticed that, according to the Quicksilver labels, the SAE 90 is for 75+ hp while the SAE 80W-90 is for below 75hp. Do you think it will hurt to continue to use the SAE 90 on my 60hp? I didn't notice any issues last year. Also, what is the difference? I heard the 90 was a better grade; if so, I might just keep running it.

Thanks for your help guys.

bassboogieman · 02-03-13, 01:34 PM

I'm no expert but I think you'd be just fine, if not better off, with the multi-weight oil. Viscosity is a measurement of how oil flows and with a multi-weight, the upper number is the measurement in a warm engine, the lower in a cold engine. A multi-weight gives better oil flow when the engine is cold than a single weight, while giving nothing away when the engine is warm. Check with your dealer or mechanic to be sure to make no changes that may void a warranty.

OkobojiEagle · 02-04-13, 09:14 AM

I've been using 90w in a 30hp Evinrude for a couple decades!... also use it in some spinning reel bearings.

oe

MO_CPA · 02-06-13, 07:50 PM

Thanks for the info guys.

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02-03-13, 12:18 PM	#1
MO_CPA BassFishin.Com Active Member Join Date: Jun 2011 Location: Ozark, Missouri Posts: 361	SAE 90 vs SAE 80-90W Hey guys I run a 60 4stroke Mercury on my boat. Last year when I purchased the lower unit oil I bought the SAE 90 (my owners' manual is mute to which to buy SAE 90 vs SAE 80W-90). At any rate, I was browsing at Bass Pro last night and noticed that, according to the Quicksilver labels, the SAE 90 is for 75+ hp while the SAE 80W-90 is for below 75hp. Do you think it will hurt to continue to use the SAE 90 on my 60hp? I didn't notice any issues last year. Also, what is the difference? I heard the 90 was a better grade; if so, I might just keep running it. Thanks for your help guys. __________________ Whatever you allow is what will continue. Last edited by MO_CPA; 02-03-13 at 12:48 PM.

02-06-13, 07:50 PM	#4
MO_CPA BassFishin.Com Active Member Join Date: Jun 2011 Location: Ozark, Missouri Posts: 361	Thanks for the info guys. __________________ Whatever you allow is what will continue.

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02-03-13, 01:34 PM	#2
bassboogieman BassFishin.Com Super Veteran Join Date: Feb 2006 Location: Parkesburg, Pa. Posts: 3,762	I'm no expert but I think you'd be just fine, if not better off, with the multi-weight oil. Viscosity is a measurement of how oil flows and with a multi-weight, the upper number is the measurement in a warm engine, the lower in a cold engine. A multi-weight gives better oil flow when the engine is cold than a single weight, while giving nothing away when the engine is warm. Check with your dealer or mechanic to be sure to make no changes that may void a warranty.

02-04-13, 09:14 AM	#3
OkobojiEagle BassFishin.Com Active Member Join Date: Mar 2011 Location: NW Iowa Posts: 270	I've been using 90w in a 30hp Evinrude for a couple decades!... also use it in some spinning reel bearings. oe

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