Mercruiser 3.0l I4 engine oil

[ArkBoater]

Hey gang.

How much engine oil does a 1988 Mercruiser 3.0l I4 need? (I'm thinking 4-5 qts but not 100% on that) I'm going to replace it tomorrow and can't remember off the top of my head. I figured someone on here might (ha) know. Also, what weight is recommended? I don't have a service manual (although i did look through the one posted above and couldn't find the amounts). Thanks a bunch guys!

Nevermind on the filter. Found what I need as far as that goes.

 

[jafo9]

Re: Mercruiser 3.0l I4 engine oil

just happened to have my manual handy for my 2005 3.0L. states 4 U.S. Quarts.

 

[Rocky_Road]

Re: Mercruiser 3.0l I4 engine oil

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 correct viscosity, with an API service rating 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 is 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

The above is from the 3.0 Service Manual....

 

[ArkBoater]

Re: Mercruiser 3.0l I4 engine oil

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 correct viscosity, with an API service rating 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 is 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

The above is from the 3.0 Service Manual....

Thanks guys. I just so happened to buy quicksilver 25w40 when I was at academy and I got 5 qts so I should be good to go! Thanks for the replies!