I wanted to get some opinions from the experts. Should I use Synthetic or Concentional oil in my 289 stang. The engine had 6,000 on it after its rebuild. Also does anyone have a preference on a brand. I have used regular pennzoil in my every day cars. I have always changed it every 3,000 and have always goten well over 100,000 miles out of a car before I traded it in on a new one. Thanks for all the Help. It is really nice to have a good source of info for us new to the wonderfull world of these classic machines.

 

You're on the correct oil path, don't change.
Jim

 

Since it only has 6K miles after a rebuild I would definitely go with a synthetic oil. Several oil studies I have read rate the Mobil 1 right up there with Amsoil and Red line. One test said that Mobil 1 ran 14,000 miles with a filter change at 5K miles and it was just as good as the day it was added to the engine. You can also get Mobil 1 at Wal-Mart but you have to order Amsoil and Redline from an individual dealer. Use a Wix or Motorcraft filter with Mobil 1 oil and you will be set.
http://neptune.spacebears.com/cars/s.../oil-life.html

 

Soaring
I have been reading up on amsoil. I did read that Mobil 1 was right up there with amsoil and that was in amsoil's own tests.
Should ai use the full size FL1A filter?
I added a remote Oil kit to my expedition so I can use the FL1A filter on it instead of that 1/2 size thing.
If i go with the synthetic can I go longer on the oil changes. I do not think it will be a milage thing but I would like to possibably change the oil twice a year once in the spring with 20-50 and in the fall with 10-40.

 

mobil 1 really is the best oil to use - not because it tests at the top of the heap, but because it tests close to the top yet is easily found.

even knowing that, i have used pennzoil all my life and continue to do so with their synthetic in my 2006. advance auto parts has them buy one get one free this month, cant beat the price and even if it doesnt beat mobil in some lab test we all know any name brand oil is a quality product.

(my van has used pennz 10w40 dino oil from day one and although its on the second motor the van has 568,000 miles on it)

 

Yeah, the Fl1A is what you should use. I change mine twice a year too. And, the reason is not that the synthetic oil breaks down, it's that moisture tends to collect in the oil pan, and Ford recommends that you change the oil at a certain mileage or at least twice a year no matter how many miles you drive it. I put 5K miles on mine, then change the filter and drive it 5K more. That makes the synthetic less expensive than dino oil because you would have to change dino three times to one for the syn.

 

well put, and if your only doing twice a year you can find the oil on sale and pick up two changes worth..... even more savings

 

I guess I should have also mentioned Royal Purple and Wal-Marts own brand that rate at the top too. There are others, but be careful to read the label carefully, because many brands are a synthetic blend.

 

walmart full syn FTL[:'(]

you can pretty much count on that crap having the least amount of refining and quality additives that make other oils better than plain ol' oil

 

I use Amsoil in everything I own. And no, I am not a dealer for it. It is available online as mentioned. But, you may be surprised how many local shops sell it too. I believe you can go to their web site to locate a retailer. I see their banner add flashing on this web page as I type. I assume they are a sponsor.

Mobil 1 is a great product too. I use Amsoil mainly due to the extended oil change intervals. I was not able to find a definate answer about Mobil 1's longevity. I have a 2000 Taurus (24V DOHC)that I use on my 110 mile daily commute. I change my oil and filter once a year, or every 25,000 miles. I had a time where I didn't get to it for 33,000 miles. My engine still runs like it was new. Amsoil's new filter lets you go up one year or 25,000 miles. The old filters needed to be changedevery 6 months.

For my classics, I use Amsoil's Marine & Diesel duty blend. The only difference is it that it stays "stuck" to the metal parts of an engine. It's great for the occaisional use vehicle. It "creeps" up the block. There is always a film of oil coating the entire inside of the engine. It minimizes the chance ofdry bearings when starting. It also prevents rust formation. Oh, and it is excellent for small engines too. My 25 year old lawn tractor starts like a champ when I go out to clear the driveway in below zero temps.

You can convert from conventional oil at any time after the engine has been broken in. There is a process to it. The web site expalains it. If your engine has had a recent rebuild I would switch. If it had a ton of miles on it, and you didn't know it's oil change history, leave it alone.You may loosen upsome nasty sludge, and cause a blockage in an oil passage. Also, you should not use synthetics immediately after a rebuild. The rings will never seat in the cylinders.

I recommend going to the Amsoil web site. There is a wealth of knowledge about oils. I think some of their sales techniques are a bit quirky, but it is an excellent product.

Just my $.02