2 different Quicksilver oils
12-01-2018, 02:23 PM
#1
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Thread Starter
2 different Quicksilver oils
Hey, ready to change the oil in my 96 Formula 303 with 502 mpi's. I want to put in Mercruiser Quicksilver 25W 40, but I see there is a regular and a synthetic blend. The synthetic blend is rated FC-W. Is there any advantage to using one or the other? I'm in SW Florida, so, boating season is still on and typically 70-80 degrees this time of year. The water temp is usually in the 60's & 70's now (not to rub it in with the northern readers, but just to know what the conditions that the boat is operating in).
12-01-2018, 03:09 PM
#2
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Don’t know the differences. I use rotella t4 15-40 in engines. First sample tested good. Will be sending out the next change also. I do run merc high performance in the drives. I asked daryl at HRE about oils. He said as often as I planned on changing it the benefits of synthetic wouldn’t help much.
12-01-2018, 11:20 PM
#3
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i use the regular in most applications,i don,t really think syn blend is worth the money.for me full synthetic or regular.
12-02-2018, 08:59 AM
#4
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Dino oil is still good to use, in my engines I use synthetic Mobil one 15W-50. Last time I got it was at Walmart for around $23.00 for a jug. Drives, Merc High Performance. A lot of god oils out there.
Last edited by kjm5125; 12-02-2018 at 09:00 AM. Reason: clarification
12-02-2018, 09:52 AM
#5
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FWIW circa '96 7.4lx mpi's here with no leaks until I ran Valvoline VR1, now both leak. VR1 is full synthetic, should've kept with non-syn and added zinc as I had previously done.
12-02-2018, 12:09 PM
#6
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yep,i have seen several high mileage engines develope oil leaks after switching to full synthetic.
12-02-2018, 01:21 PM
#7
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Platinum Member
Same engine (but 2000) . Used the regular 25/40 for the first year or two and then when the synth blend came available switched over to it. Considering going to the full synthetic 20/50 as at the Merc dealer there's not a whole lot of difference in the price between them . (believe it or not)
Without getting into the entire controversial oil argument they're all very good and you won't have any problem.
Without getting into the entire controversial oil argument they're all very good and you won't have any problem.
12-02-2018, 02:10 PM
#8
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Never seen a motor damaged from any oil, only lack of maintenance
Being in FL I would just use straight weight no W needed.
I use Dino straight 40 in the 454, and Brad Penn straight 50 in the 509
Being in FL I would just use straight weight no W needed.
I use Dino straight 40 in the 454, and Brad Penn straight 50 in the 509
12-02-2018, 02:46 PM
#9
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Grey bottle is conventional...black bottle synthetic....was up thru this spring anyway.
12-03-2018, 09:25 PM
#10
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yes. I run 20-50 VR1 conventional. Has worked great for me. Easy to find, price not bad.
