Just had my Cobra drive rebuild and the guy said to use Volvo Synthetic gear lube

Donzi GT250

Petty Officer 2nd Class
Joined
Apr 22, 2011
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I recently had my 1990 OMC Cobra dive rebuilt (gears, bearings and seals) and the guy who rebuilt it gives a two year warranty but wants me to use Volvo 75W-90 Synthetic Gear Oil instead of what I have used before Johnson HPF Pro.
Any reason to not to use the Volvo synthetic gear lube? I am under the impression that the Volvo synthetic is specifically for certain Volvo drives with cone clutch arrangements. Is this correct? I have 10 hours on the new drive and he (the re-builder) wants the lube changed at the first 10 hour mark.
Thanks
 
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