www.iFourWinns.com

2x 4.3volvo in a 298.

Both are consuming oil, approx .5 liter for 6hours cruising.
I dont see smoke. Always run it with Full Syntech Volvo SAE30.

Im pretty sure the ring are not doing a good job. There is no leak.

Question ; Mercuiser and Volvo are both GM block. Why Mercruiser required 25w40 and volco SAE30 ?

I my idea SAE30 is very liquid during a hot day at 4000RPM. If I put 25w40 instead what do you think ?
Im pretty sure it better to add .5liter per week end , what do you think ?
thanks

"Volvo" branded 30w synthetic will soon not be availavble. They have switched to 10W40 synthetic.
Read this link: viewtopic.php?f=11&t=8427&p=81693#p81693

So if you want to change, now is a good time. But the Merc oil will not help your oil consumption, there is another issue that you are going through that much oil. I have put over 100 hours on my 4.3L engines, and have not even used .5 liter on either engine. Have a compression check done on both engines first.

_________________
One of 4 Previous (Sold) Boats:
2000 Four Winns 268 Vista

Current Boat: 2004 Chaparral 235 ssi cuddy