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Forum: General Q & A

12-16-2012, 09:12 PM

Replies: 91

synthetic oil in 500EFI?

Views: 38,913

Posted By On Time

So, I've always run Merc 25W-40 dino until last...

So, I've always run Merc 25W-40 dino until last year switched to Merc 25W-40 semi-syn in all 3 current 4 cycle marine engines. Always changed at 50 hrs std duty engines and 25 hrs high perf engines....

Forum: General Q & A

09-10-2012, 03:18 PM

Replies: 91

synthetic oil in 500EFI?

Views: 38,913

Posted By On Time

So how many Mercury oils are there? Is it...

So how many Mercury oils are there?

Is it true there are three?
1 Original 25W-40
2 Blended semi synthethic 25W-40
3 Full synthetic 20W-40

Which one would be the best for 500/525 engines?...

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