Gear Case Lubricant for older OMC

[Buster]

I use Evinrude Johnson HI-VIS gearcase lubricant, part number 775603. The directions call for its use on 1973 and newer engines. Does anyone have any experience using this product on OMC engines older than 1973? Is there any harm? Is there a better choice for the older motors?

[crosbyman]

Price wise why not use conventional gearcase oil …I will venture to say it won’t harm older engines

Joining AOMCI has priviledges 🙂

[Mumbles]

I used to buy Hi-Vis by the pail when I could get it and used it in all my post war non electric shift motors requiring oil in the gearcase. Since I can’t get it anymore, I now use name brand marine rated gear oil from my auto supply or Canadian Tire. It’s probably all the same stuff but the packaging is different.

[rmhxruss]

Back in the early days 1968 – 1976 era we used Type C in all gearcases. Then used HiVis later. Never had problems at that time.

• This reply was modified 3 years, 4 months ago by rmhxruss.

[fleetwin]

There is no harm in using Hi-Vis in older mechanical shift gearcases, it makes perfect sense. But, you still must use premium blend and any electric or hydro-electric shift gearcase. OMC probably published this recommendation out of pure simplicity. 1972 was the last year hydro-electric gearcases were used in outboards, so it was easier/more clear/less confusing to just recommend using type C/premium blend in outboard 72 and older.

[outbdnut2]

I use Sierra Premium gear oil (Synthetic Blend) in all gearcases except electric shift or old ones that need thick grease. I buy it in a 5 gallon pail. Price is right for how much you get! Approx $135 for 5 gallons at Amazon and other places. That’s $6.75/quart. Compare that to around $20 a quart for OEM gear oil.
Dave

https://www.amazon.com/Sierra-18-9600-5-Premium-Lower-Unit/dp/B00021UR28/ref=sr_1_1?keywords=sierra+18-9600&qid=1641055589&s=automotive&sr=1-1

• This reply was modified 3 years, 4 months ago by outbdnut2.

[rmhxruss]

HONDA Marine OEM gear oil sells at the dealers for $8.50 a quart.

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