Don't know that much about the Volvo's never owned one and have no desire to. Personal preference I guess, Merc's Alpha drive has been around for a long time and has a proven track record of being pretty bullet proof. Volvo on the other hand is a glorified OMC which let's face it didn't have a good track record. I understand the past few years Volvo really straightened out the SX drive units and they are supposedly pretty good. Dunno maybe that's true. There is no question the shifting in the Volvo is way smoother than the Merc.
I don't change my impeller every 2 years in the Alpha they last much longer than that. Matter of fact the new one I'm putting in is made of a new material that has a much longer life expectancy. It was DaveR that said his Bravo drive needed the impeller replaced every couple of years, and to that I say that's a poor design. I've let my Alpha go long enough, 9 years, it's time.
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