motor oil recommendations

[chiln22]

I know this is a no brainer but I need help! I have a 1983 Mercruiser 898 I/O with an upgraded 350 block. I was looking in the manual and it recommends using 25W-40 motor oil. I have been looking online and everywhere I look the price is ridiculous.<br /><br />Would it hurt the engine if I use a automotive 10W-40 motor oil? If not, does anyone know if cheaper website to find this oil? Also, can I use a automotive antifreeze or do I have to buy a special marine antifreeze?<br /><br />Thanks in advance.

 

[tommays]

Re: motor oil recommendations

chiln22<br /><br />use the RED search function you will have to read for hours about all the views on oil and in the end pick for yourself<br /><br /><br />the manual gives you several picks ST 30 ,st 40 ect ,ect depends on the temp were you boat<br /><br />antifreeze just needs to be antifreeze nothing special<br /><br /><br />tommays

 

[Don S]

Re: motor oil recommendations

Look at the chart for straight weight temp ranges.<br /><br />

 

[LubeDude]

Re: motor oil recommendations

Originally posted by chiln22:<br /><br />Would it hurt the engine if I use a automotive 10W-40 motor oil?

Do not use a 10W-40 in or for anything except maybe burning brush. Its the worst wirght oil you can by, some engine manufactures even will void your warantee if they find you using it.<br /><br />If you are not racing, or running the engine WOT everywhere you go and you use the boat as most people do, Cruising, tubing, ocational WOT, then you can use a Long Life or a diesel 15W-40 such as Dello 400. Many here do and it works fine for them. Otherwise use a CH-4 rated 40 wieght.

 

[TheOilDoc]

Re: motor oil recommendations

There is no reason to use a 15W-40 diesel oil (which won't meet the requirements) when you can use a straight grade, 20W-40, 20W-50 or the 25W-40 oil that will meet the requirements.

 

[blackz3]

Re: motor oil recommendations

good job dons now whats the two posts after the chart for...