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Old 11-05-2011, 12:42 PM
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Default Mercruiser Oil

Just wondering what everyone uses to change their oil in their Mercruiser?

I have a 5.0MPI that I am getting ready to change the oil on and I know what Mercury recommends but that doesn't mean its the only thing out there.

David
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Old 11-05-2011, 01:04 PM
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I have used NAPA 20w50 withno problems when rigged new volvos from factory but would stay with manufactured recommended oil
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Old 11-05-2011, 02:57 PM
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Shell Rotella 10W30

Spend some time searching Bob the Oil Guy's forum and you will learn every thing you ever wanted to know about oil.

http://www.bobistheoilguy.com/forums...s.php?ubb=cfrm
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Old 11-05-2011, 03:26 PM
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Valvoline 15w-40. The MPI is probably a roller lifter motor..if not, it MUST have an oil with Zinc additive.
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Old 11-05-2011, 04:16 PM
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I should mention some late model GM's will wear out the distributor drive gear if too heavy an oil is used. 50 weight is way too heavy. Most factory recommendations are 30 weight max.
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Old 11-05-2011, 05:12 PM
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15w-40
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Old 11-05-2011, 06:00 PM
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The Mercruiser service manual.calls for Quicksilver 4-Cycle 25W-40 Marine Engine Oil

I will be using this boat pretty much all year and it does get below 0F on a regular basis in VA.

Thanks for all the replies.

Nowsthetime, I have been going through that website, but its a little overwhelming with all the new acronyms they are using.
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Old 11-05-2011, 06:02 PM
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Merc has recommendations on their website, they of course recommend their oil, but you can use straight 40 above 50* and straight 30 below 50* according to them.
I like one of these....
Chevron Delo 400
Shell Rotella
Pennzoil Marine

all three are HD oils that work well with marine inboards....
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Old 11-05-2011, 06:14 PM
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To help obtain optimum engine performance and to provide maximum protection, we strongly recommend the use of Quicksilver 4-Cycle 25W-40 Marine Engine Oil. This oil is a special blend of 25-weight and 40-weight oils for marine engines. If not available, a good grade, straight weight, detergent automotive oil of the correct viscosity, with an API classification of SH, CF/CF-2, may be used.

In those areas where Quicksilver 4-Cycle 25W-40 Marine Engine Oil or a recommended
straight weight oil are not available, a multi-viscosity 20W-40 or, as a second but less
preferable choice, 20W-50, with API service ratings of SH, CF/CF-2 may be used.
IMPORTANT: The use of non-detergent oils, multi-viscosity oils (other than
Quicksilver 25W-40 or a good quality 20W-40 or 20W-50), synthetic oils, low quality
oils or oils that contain solid additives are specifically not recommended.

The chart below is a guide to crankcase oil selection. The oil filter should always be changed when changing the engine oil.
CAUTION
Mercury MerCruiser or Quicksilver 4-Cycle oil is recommended for use for your engine.
Severe engine damage may result from the use of an inferior oil.

75796 Quicksilver 4-Cycle 25W-40 Marine Engine Oil

SAE 20W..............SAE 30W..............SAE 40W
..............>32 F......................50 F<
..............0 C.........................10 C
AIR TEMPERATURE
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Old 11-05-2011, 06:26 PM
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Quote:
Originally Posted by Widdy View Post
To help obtain optimum engine performance and to provide maximum protection, we strongly recommend the use of Quicksilver 4-Cycle 25W-40 Marine Engine Oil. This oil is a special blend of 25-weight and 40-weight oils for marine engines. If not available, a good grade, straight weight, detergent automotive oil of the correct viscosity, with an API classification of SH, CF/CF-2, may be used.

In those areas where Quicksilver 4-Cycle 25W-40 Marine Engine Oil or a recommended
straight weight oil are not available, a multi-viscosity 20W-40 or, as a second but less
preferable choice, 20W-50, with API service ratings of SH, CF/CF-2 may be used.
IMPORTANT: The use of non-detergent oils, multi-viscosity oils (other than
Quicksilver 25W-40 or a good quality 20W-40 or 20W-50), synthetic oils, low quality
oils or oils that contain solid additives are specifically not recommended.

The chart below is a guide to crankcase oil selection. The oil filter should always be changed when changing the engine oil.
CAUTION
Mercury MerCruiser or Quicksilver 4-Cycle oil is recommended for use for your engine.
Severe engine damage may result from the use of an inferior oil.

75796 Quicksilver 4-Cycle 25W-40 Marine Engine Oil

SAE 20W..............SAE 30W..............SAE 40W
..............>32 F......................50 F<
..............0 C.........................10 C
AIR TEMPERATURE
What a crock. Makes it sound like your small block Chevy will absolutely self destruct if you don't use their oil. I hope GM doesn't find out they've been using the wrong oil for 50+ years....
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Old 11-06-2011, 04:36 AM
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1 - When I bought a new boat in 1989 with a Mercruiser, concerned about warranty and wanting to use the correct oil, the owners manual said (at that time) they do not recommend multi-viscosity oil. 2 - Mercruiser oil was multi-viscosity oil. 3 - Having spoken to the dealer about 1 and 2, I asked what exactly was in the 55 gallon drums they were using to put oil into customers boats and they did not know. Strike 3, they were out.

4 - I used whatever was on sale at Aid Auto Store. Oil, with the correct rating.
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Old 11-06-2011, 06:41 AM
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They claim that their 25/40 is not a multi vis but a combination of those 2 viscosities, with no VI improvers. What did they do, mix a 1/2 qt of 25 wt and a 1/2 qt of 40? I still use the straight weights, they work fine if you don't boat in real cold weather. Under 60 degrees is too cold for boating for me anyway!
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Old 11-06-2011, 07:07 AM
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I use Rotella 15w40. Mercruiser does recommend their 25w40 but I don't see the need to spend that much money when I believe I am using an oil that is as good or better for less $.

I wouldn't use 10w30.

If I couldn't find 15w40 (this never happens) I might use straight 30w or 20w50.
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Old 11-06-2011, 07:21 AM
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Quote:
Originally Posted by baypro21 View Post
I use Rotella 15w40. Mercruiser does recommend their 25w40 but I don't see the need to spend that much money when I believe I am using an oil that is as good or better for less $.

I wouldn't use 10w30.

If I couldn't find 15w40 (this never happens) I might use straight 30w or 20w50.
Rotella 15W-40 is Cheaper than the rest & is a very good oil
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Old 11-06-2011, 07:41 AM
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Quote:
Originally Posted by nowsthetime View Post
Shell Rotella 10W30

Spend some time searching Bob the Oil Guy's forum and you will learn every thing you ever wanted to know about oil.

http://www.bobistheoilguy.com/forums...s.php?ubb=cfrm
I hope your kidding (Shell Rotella 10W30)
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Old 11-06-2011, 07:49 AM
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10w-30 is ok in lower temps but for more normal ( read warmer)boating I would go with different weight .
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Old 11-06-2011, 07:49 AM
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Quote:
Originally Posted by Widdy View Post
To help obtain optimum engine performance and to provide maximum protection, we strongly recommend the use of Quicksilver 4-Cycle 25W-40 Marine Engine Oil. This oil is a special blend of 25-weight and 40-weight oils for marine engines. If not available, a good grade, straight weight, detergent automotive oil of the correct viscosity, with an API classification of SH, CF/CF-2, may be used.

In those areas where Quicksilver 4-Cycle 25W-40 Marine Engine Oil or a recommended
straight weight oil are not available, a multi-viscosity 20W-40 or, as a second but less
preferable choice, 20W-50, with API service ratings of SH, CF/CF-2 may be used.
IMPORTANT: The use of non-detergent oils, multi-viscosity oils (other than
Quicksilver 25W-40 or a good quality 20W-40 or 20W-50), synthetic oils, low quality
oils or oils that contain solid additives are specifically not recommended.

The chart below is a guide to crankcase oil selection. The oil filter should always be changed when changing the engine oil.
CAUTION
Mercury MerCruiser or Quicksilver 4-Cycle oil is recommended for use for your engine.
Severe engine damage may result from the use of an inferior oil.

75796 Quicksilver 4-Cycle 25W-40 Marine Engine Oil

SAE 20W..............SAE 30W..............SAE 40W
..............>32 F......................50 F<
..............0 C.........................10 C
AIR TEMPERATURE
That was about 15 years ago! Now it's FULL syn. 20-40
http://www.mercurymarine.com/engines...rives/5.0-6.2/
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Old 11-06-2011, 08:52 AM
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Quote:
Originally Posted by Drumsfeld View Post
I hope your kidding (Shell Rotella 10W30)
Not kidding!

I built my own motor and trust me I did my research on what oil I use.
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Old 11-06-2011, 09:29 AM
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I'd recommend going on BobIsTheOilGuy.com

Those guys are very educated & most are Chemists.
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Old 11-06-2011, 10:31 AM
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I have used Merc/Quicksilver 25w-40 oil in my Suburban for 330,000 miles so far. Probably change it maybe two or three times a year IF I remember to.... At 70 mph, I'm @ 1400 rpms. I don't baby the truck, and tow boats slowly,,,,, (I've had about 4 transmissions tho...). Anyways, Stock boat engines turn 4400 to 4600 rpms @ WOT. You'd have a hard time convincing me that "any 'ol oil" will do, when your boating investment needs an oil change just once a year. And yes, older flat-tappett blocks better have an oil with zinc or the cam will be gone in an hour,,,,, People just don't believe..
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