Oil for 347? 20w-50?

Joe 5.0

Founding Member

Feb 1, 2002

1,184

2

38

Macomb, MI (metro detroit)

Aug 22, 2006

#1

• Aug 22, 2006

• #1

Just bought a built cobra with a 347, and the previous owner always ran 20w-50 Amsoil. The only thing is that its $9/qt, and it goes through about a an extra qt every oil change, and it has a 7qt pan.

Do I HAVE to run this thick of an oil? Will it burn off something thinner, like a 10w-30 Mobil 1 that much more? Is the 20w-50 that much better at protecting the engine?

 

Grn92LX

Fidanza Man!

Founding Member

Jan 14, 2001

6,819

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New York

Aug 22, 2006

#2

• Aug 22, 2006

• #2

You really need to talk to the builder and he'll check the specs and tell you what to run.

I run mobil 1 15W50 in my 347.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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129

Aug 22, 2006

#3

• Aug 22, 2006

• #3

Did the PO mention having an oil control issue?

If you go thinner, it will be more likely to burn, generally speaking. I suspect that's why the thicker oil was used...........


I would be wanting to try what Mike uses. I'd try and track down where the oil is going.

Good luck.

 

Joe 5.0

Founding Member

Feb 1, 2002

1,184

2

38

Macomb, MI (metro detroit)

Aug 22, 2006

#4

• Aug 22, 2006

• #4

It does burn a little, the engine has 55k on it. Not more than what i would consider normal for a forged 347 with 55k on it though.

I dunno, i just wish there was someone that made 20w-50 that wasnt nearly $10/qt.

 

W

wytstang

Mustang Master

Mar 14, 2004

4,988

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78

Summerville,SC missing South Fl. weather :(

Aug 22, 2006

#5

• Aug 22, 2006

• #5

For testing purposes only I would use a cheap 10w40 and see how much more or less it uses. Then swap out to a quality oil, Motorcraft 10w40 synthetic blend .