mikebrls

how many of you guy's run synthetic oil in the 525 merc motor's ?
thank's
mike

THLWL

I would love to. However, last week I spoke with Merc. Racing folks and they said to run Merc. 25w40 non-syn. So that's what I'm running. Teague says no problem to run synthetic in his mag. articles though. I would also like to know if any are running synthetic. The new syn. Mercruiser motor oil is NOT for Merc. Racing motors. The Mercury Racing branch is different from Mercruiser or Mercury.

gsmith9898

I have every since break in. Mobile one 15-50

dukenrock

15/50 Mobile 1 every 25 hours.

Steel Outlawed

iTrader: (1)

Mobil 1 15w50 always in my 500 efi's

boaterh

Mobil 1 V-twin only ....every 20 hours

crb76

Mobil 1 15-50. Last change after 30 hours it looked great.

Pesky Varmint

Mobile 15-50 in 575SCi's with 430 hours.

Just did a valve job due to leakdown (tired valves).

I could still see the crosshatching on the cylinder
walls.

Pesky Varmint

JCat 38

Mobil 1 15-50, in my 500 EFI's and used by the previous owner too!

DMOORE

Good news to hear. Can't really say much more about a product's effetiveness than that.



Darrell.