Best oil for the 4.6L Ford Modular.

[TeeDub]

I'd run the Amsoil Series 2000, 0w30 in this application, for max protection from wear/deposits and minimal oil consumption.

I'd recommend using oil analysis to fine tune the OCI, but certainly you can easily expect to safely run 10k-15k/1 yr, based on my experience with this engine/oil combo....

 

[427Z06]

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Since the question is regarding a 4.6 in s police interceptor I thought I would chime in. My local dept has about 2,000 marked units. All crown vics, 99-06 models. They have been using a 10w30 synthetic blend for the past coulple years, mostly 76 Super Synthetic Blend.

I asked one of the mechanics about engine failurs. He stated that he has seen less engine failures since they went to the 10w30 blend.

This dept has never used the 5W-20, as the cars they used before the vics also used 10-30. The mechanic said "they" feel the 10w30 gives better protection under this kind of abuse---LOOONG IDLE times then to high reving, hard driving.

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I'm so tired of reading this crapola.

http://theoildrop.server101.com/forums/showflat.php?Cat=0&Number=753141
http://theoildrop.server101.com/forums/showflat.php?Cat=0&Number=765552

We also have a member here that manages a database for fleets of vehicles. His analysis shows life expectancy for 5w20 spec'd engines using 5w20 to be just as long as any other grade.

http://theoildrop.server101.com/forums/s...0490#Post790490

 

[Patman]

That's the problem when they let their "old school mechanics" make the decisions for them. These same old school kind of guys will also tell you that you can't possibly run your oil past 3000 miles or the engine will die a most painful death.

I wish more mechanics were knowledgeable in motor oil, but sadly, they are not.

This site has more than proven that 5w20 oils are very capable of long engine life. Even in situations we didn't think possible (such as hot weather and towing!)

 

[427Z06]

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The only reason why I don't use 10w30 is because of the rumor that it has a lower grade basestock.

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Similar statements about base oil quality for a 10w30 have appeared on this forum over the last several weeks and I just don't see the justification to back up this idea.

Probably the toughest GF-4 test is the Sequence IIIG, which is run for 100 hrs at 3600rpm and 150C (300F) degrees.

All the common GF-4 grades 5W-20, 5w30 & 10w30 must pass this test. How would the 10w30's pass if the base oil did not have Grp II high temperature resistance?

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If you buying low-ball conventional 10w30, there's a chance it may contain Group I basestocks.

http://www.chevron.com/products/prodserv/BaseOils/gf4.shtml
http://www.chevron.com/products/prodserv/BaseOils/gf4_faq.shtml

A survey of MSDSs confirmed it does occur.

Further, Ford doesn't have additional testing requirements for the 10w30 grade like it does for the 5w20 and 5w30 grades since they no longer spec it for any of their vehicles. In short, most SM/GF-4 10w30s aren't passing the same test requirements.

 

[427Z06]

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I'd run the Amsoil Series 2000, 0w30 in this application, for max protection from wear/deposits and minimal oil consumption.

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Of course, Ted. You sell Amsoil. What else would you recommend.

 

[AndyH]

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I'd run the Amsoil Series 2000, 0w30 in this application, for max protection from wear/deposits and minimal oil consumption.

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Of course, Ted. You sell Amsoil. What else would you recommend.

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Ted...as in "TooSlick"? Is "TeeDub" really "TooSlick" reincarnated?

 

[Fordiesel69]

Lastly, how would GC 0w30 run in this engine? A nice thin weight when cold and close to a 40wt when hot. Sound like the perfect oil. Any opinions?

 

[Steelers]

GC runs fine in a 4.6 Ford. Used it for one 10K run and it ran very smooth and quiet. Truck felt ever so slightly sluggish, certainly wouldn't go heavier, no need really. If you do your own oil changes go for it.

Patman is 100% correct. I'm tired of "old school" mechanics ranting about 20 weight motor oils trashing engines. We've seen no evidence of that here going back several years now. With so many brands both synthetic and not, choose one and enjoy the (slightly) incresed fuel economy.

My 4.6 runs just fine on MC 5w-20.

 

[427Z06]

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Lastly, how would GC 0w30 run in this engine? A nice thin weight when cold and close to a 40wt when hot. Sound like the perfect oil. Any opinions?

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It's not thin when cold, only when it's at the limit of it's operational temperature range.

You need to get over this "thicker is better" for engines that spec 5w20s like the Ford modular 4.6

Here's more evidence thicker oil isn't going to help with this engine:

http://theoildrop.server101.com/forums/showflat.php?Cat=0&Number=243823
http://theoildrop.server101.com/forums/showflat.php?Cat=0&Number=231665

Add up the wear metals and you'll find 1ppm difference between using 5w20 and 5w40.

 

[Fordiesel69]

No not at all. I have no real "problem" with 5w-20, it is just that I was curios if the GC is FAR superior and is it a good oil for this engine. I know some engines do excellent with it and others don't. Thats all.

 

[Cujet]

Interestingly enough, the 5/20 was only slightly worse than the thicker oils.

Chris

 

[427Z06]

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Interestingly enough, the 5/20 was only slightly worse than the thicker oils.

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Huh? Try making some sense when you post.

 

[Islandvic]

My '96 Vic with 160k miles likes Valvoline Maxlife Synthetic the best. It has the least oil consumption with it.

If your 4.6 does not consume oil, you should stick with the Motorcraft you are using.