Mercruiser 4.3l oil

[LouC]

Yes Electric Boat is still in Groton Ct, used to pass it on the ferry on the way to RI for Boy Scout Camp.
The CG station is still in Eaton's Neck and on the marine weather radio you do get reports for winds, etc from there and various other locations.
We go to Sore Thumb and Democrat Point on Fire Island. This is at Sore Thumb facing Democrat Pt. I use this Jeep (07 Grand Limited with 5.7 Hemi) our first one (98 Grand 4.0 six) and my son brings his '17 Wrangler there often.

 

[alarmguy]

Yes Electric Boat is still in Groton Ct, used to pass it on the ferry on the way to RI for Boy Scout Camp.
The CG station is still in Eaton's Neck and on the marine weather radio you do get reports for winds, etc from there and various other locations.
We go to Sore Thumb and Democrat Point on Fire Island. This is at Sore Thumb facing Democrat Pt. I use this Jeep (07 Grand Limited with 5.7 Hemi) our first one (98 Grand 4.0 six) and my son brings his '17 Wrangler there often.
View attachment 122404

Very cool, Electric Boat and the Coast Guard station at Eatons Neck.
There used to be a Coast Guard station at Gilgo beach which was eventually abandoned and then like a decade later torn down, the big granite boulders I believe is still on the beach that used to protect the Coast Guard station from the ocean.
When we were teenagers before we drove my friends parents would drive us down there and drop us off with our surfboards.

Now I believe the Fire Island Coast Guard station and I assume the Short Beach Coast Guard station is still there on Jones Inlet.

^^^^ awesome photo ^^^^
Not much left in NY that I like but when it comes to the beaches, bays, sound and ocean there in nothing else like it and spending 40 years of my life there truly was an experience I wouldn’t trade for anything.
I feel very fortunate to grow up there and with the friends and experiences we had.

Small world and truck looks awesome there.
I’ll admit sometimes when I do reminisce and talk to people that are still there I miss those times for sure.

A childhood best friend still lives there I’ve known him since kindergarten. He now lives in East Northport but boats on the south shore, still takes trips to Fire Island.
He’s a bit of a boat enthusiast, has restored a vintage Fiberglass boat by purchasing two of them for the best parts. You also has a modern day 28 foot SeaRay.
He was always the one with the 4 Wheel Drive that we took to the beaches and I think he still does.

 

[kbowley]

"Been around a lot of boat owners comparing fuel usage. The 4.3 works harder to stay on plane than the 5.0 in the same size/weight boat. Sure, idling around may be different but as stated—-on plane."



You are incorrect, my dear friend. In identical boats, identically loaded, and with identical outdrives, both engines will require the exact same power/torque to push the boat through the water. Put another way, both boats going 30 MPH will require equal amounts of power regardless of what engine is in the bay. Let's say it takes 75 hp to run 30 mph in a given hull. No matter what engine it has, it will require 75 hp. The key factor is determining which engine can produce the required 75 hp with greater fuel efficiency. The smaller displacement wins every time. Mercury provides a fuel consumption chart that I use to verify my facts. Secondly, a marine engine differs significantly from an automotive engine. The marine engine features distinct heads, valves, valve springs, a cross-drilled hardened crank with 4-bolt connecting rods and mains, a thicker lower block deck, sodium-filled exhaust valves, anti-corrosion internal coatings, and high-volume oil pumps to enhance top-end cooling during heavy loads. An automotive engine is in no way designed to run at 100% load @ 4800 rpms for hours on end; they will fail. The design of a marine engine allows it to operate continuously at 100% load without any problems.

 

[PontiacHO]

Not that anyone but me considers this…HD 15w40 is designed for diesel engines and farm equipment that operate below 3k RPM. A boat motor operates much higher. Why not use oil that is designed with anti foaming agents? The Quicksilver recommendation is perfect.

 

[Donald]

Most personal boat engines like I/O or inboard probably die from ingesting water into the engine vs wearing out the lubricated parts. Or the engine is still in good shape but the boat is old and beat and no one wants it.

 

[Donald]

Not that anyone but me considers this…HD 15w40 is designed for diesel engines and farm equipment that operate below 3k RPM. A boat motor operates much higher. Why not use oil that is designed with anti foaming agents? The Quicksilver recommendation is perfect.

So your are saying the HD 15W40 oil has little or no anti foaming agents but the Quicksilver oil does?

 

[OVERKILL]

The marine engine features distinct heads, valves, valve springs, a cross-drilled hardened crank with 4-bolt connecting rods and mains, a thicker lower block deck, sodium-filled exhaust valves, anti-corrosion internal coatings, and high-volume oil pumps to enhance top-end cooling during heavy loads. An automotive engine is in no way designed to run at 100% load @ 4800 rpms for hours on end; they will fail. The design of a marine engine allows it to operate continuously at 100% load without any problems.

I think you might be over-selling this a bit, here's a Mercruiser 4.3L being torn down, I'm seeing 2-bolt mains and and rods:

And another 4.3L, 2-bolt mains and rods:

Here's a 305, also 2-bolt mains and rods:

Here's a 350, also 2-bolt mains and rods:

And here's a 351W, also 2-bolt mains and rods:

 

[Donald]

I think you might be over-selling this a bit, here's a Mercruiser 4.3L being torn down, I'm seeing 2-bolt mains and and rods:
View attachment 282609
And another 4.3L, 2-bolt mains and rods:
View attachment 282613

Here's a 305, also 2-bolt mains and rods:
View attachment 282615

Here's a 350, also 2-bolt mains and rods:
View attachment 282616

And here's a 351W, also 2-bolt mains and rods:
View attachment 282617

I think it's the 5.7 L GM marine engine that has the 4 bolt mains same that a truck engine has. (I think).

 

[OVERKILL]

I think it's the 5.7 L GM marine engine that has the 4 bolt mains same that a truck engine has. (I think).

2nd last engine is a 5.7L GM marine engine, it has 2-bolt mains.

Edit, here's another 5.7L Mercruiser:

 

[PontiacHO]

So your are saying the HD 15W40 oil has little or no anti foaming agents but the Quicksilver oil does?

No. However if someone (me) thinks what the oil is originally blended for, then perhaps an oil blended for it’s specific application may cause someone (me) to think Quicksilver certainly has taken into account the rpm range of marine engines. My Yamaha outboard has an operating range of 5,500 to 6,000 rpms.

 

[alarmguy]

MerCruiser 25/40 is a 40 wt oil with no viscosity improvers that will break down

 

[hemitom]

MerCruiser 25/40 is a 40 wt oil with no viscosity improvers that will break down

Ran this in an mercrusier 2.5 4 banger excellent oil.
when hot kept better oil pressure than straight 30 and 15w40 .