Hi all, Well I am ready to service my Mercruiser 5.7 V8 engines and were intending to use Castrol Magnatec 10W-40, but have since been told that I should be using the GTX 15W-40, here I was thinking that it was better to use the more expensive superior product. I checked out the Magnatec for Zinc which it has to help reduce wear and not being a full synthetic, thought that it would be the bees knees, Can anyone advise which way I should go ?
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Oil Type for 5.7 ?-gctid370644
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I use mercury Quicksilver 25W40 in my VP (GM) 5.7
Tony, Cape Cod, MA
Vice Commodore Bourne Yacht Club
1994 Carver 390 Cockpit Motor Yacht
454 Merc Cruisers inboards
"HOLODECK"
2014 10' hard bottomed Dink powered by 3.3HP Mariner 2 stroke
www.bourneyachtclub.com
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Can anyone advise which way I should go ?
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I'm a fan of Rotella, but some of the GM marine engines need thicker oil. Especially the older ones. I"ve tried to troll with a V-8 using thinner oil and the oil pressure was too low. I picked up a lot of clattering in the drive train.
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