Re: 525 EFI Oil
 

Yes, we are using the tall filter and had a problem. Mech's at TNT said this is a Merc. problem and have seen it before. However, once we changed the filter the oil pressure went right back up where it was suppose to be :drink:

Re: 525 EFI Oil
 

What about using the painted black and relabled short ones? any problems with them?

Re: 525 EFI Oil
 

Mercury 25W-40 is a blend of conventional 25W and 40W oil and tests show the Cst's are comparable at 100*C to a 40 Straight Weight conventional and similiar as well to 20W-50 Castrol or Kendall GT. So any of the three are good conventional choices.

Re: 525 EFI Oil
 

Unsane, I sent the info to you the same day I received your email. You should see it today or tomorrow.

Re: 525 EFI Oil
 

I had a minute to talk with Merc today about another issue. I also discussed their 25W-40 oil with them.

The big concern they have is that a non-experienced individual might go out and purchase an "off the shelf automobile" 10W-40 with low ZDDP levels and incur a problem.

They are aware that racers of Mercury Engines use products such as 20W-50 Amsoil Severe Service Racing Synthetic with great results. But it just does not have a Merc part number on it is all.

Re: 525 EFI Oil
 

I wonder if Fram is making it for them :eek:

Re: 525 EFI Oil
 

Great info, i can agree with mercs reason

Re: 525 EFI Oil
 

There was a time when A/C made filters for Merc I understand. The A/C oil filter is excellent in flow and filtering...they are cheap too...about $3.99 ea.

I actually think I would use them myself becasue they are easy to get and trouble free. The bypass valve works very well too. They are well made filters.

Merc racing and Fram's look similiar I understand.

A/C has better parts than a Fram I think.

The graph below is from Bob's site...most prefer an A/C on a GM block engine. There must be a reason and it is probably because they are cheap and a very good match.

Anyone using them?

Re: 525 EFI Oil
 

I changed my oil today on my 525efi. The filter is upside down so when I remove the filter it makes a little mess. I noticed that when the filter was removed there is a grove about a half inch deep in the base of the mount. This was filled with a sludge. not gritty like metal but just thick. Any ideas? always used mobile one 15/50

Re: 525 EFI Oil
 

I used 15-50 Mobil 1 for years prior to Hydraulic roller cams & the new formulas. Not sure how the new formula effects the oil.

I now use Valvoline 40w racing oil due to the Hydraulic rollers. Teague published a article about not using synthetic on these so I switched to this and it seems to be as good as Mobil 1 at half the cost. Engines are very clean and not much wear.

Just works for me.