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89GT
07-17-2001, 05:22 PM
I know everyone recommends synthetic oils for their engines but I have heard that they are thinner or something and can cause leaks if everything is not tip top shape so I have not gone to them until I rebuild my motor then I will use them. BUt for know with 140K miles just using regular 10w-30 Oil but what type does everyone use or recommend? I use Castrol and I have seen Motorcraft at Autozone so just trying to see what regular type of oil everyone uses? Does it really matter?

93mustang
07-17-2001, 06:41 PM
To the best of my knowledge, you can get different weights of synthetic oil, which IS better for your engine, it helps preserve your engine far beyond that of regular oils. It wouldn't hurt to try it, I just switched to synthetic in my 93GT, and i have 126,000 miles on it, almost 127,000. I use VR1 Racing Oil, Quaker State is another popular one. Just don't go with a no-name brand that you have never heard of because it suits your wallet that day. It won't suit your wallet when your engine takes a dump on you later on down the road, know what I mean?

ELECTRA
07-17-2001, 07:02 PM
I have asked the same question a thousand times before. The conclusion (educated) is that any oil bearing the "starburst" symbol from API is an approved oil that has been tested in lab conditions. My "old" 84 5.0 H.O has 180,000 km and I run 10W40...a bit thicker then 10W30. I run this car in the summer only. The higher viscosity (in theory) is appropiate for the age of the engine. I change the oil every 3000 km. Synthetic has "marginal" benefits that, to me,does not justify the price. I would rather have more frequent oil changes then a motor full of old,dirty,(pricey),synthetic any day.

Topless89GT
07-17-2001, 10:40 PM
I have heard more than once, if you go synthetic, you should stay with it. Switching back to regular is not a good choice. Friend in Montana swears buy the stuff. He did the burn the oil on the stove experiment himself at home. He said he couldn't burn the synthetic after 30 minutes and the regular oil was fried in 15. Just my 2 cents.

MustangGTorg
07-18-2001, 11:53 PM
Well here's my 2cents...

I have used Mobil 1 5W30 in the Expedition and our old Explorer. Had to have new head put on Explorer with 32,000 miles on it. Inside of motor looked brand new. Run the Mobil 1 in the tow mobil due to you can get it everywhere.

The Ultra Blue GT hatch back gets RedLine 20W50 racing.

The Ultra Blue Convert will get Mobil 1 when I ever get time to change it over.

The red GT gets 20W50 Valvoline synth in the summer and the same oil but in 10W40 in the winter. All get the Ford Racing oil filter except the Exped.

The 65 Mustang will get Mobil one soon as the car gets some milage on the motor ( has like 2.0 miles on it right now http://64.21.184.154/ubb/smile.gif )

When I pulled the intake manifold of the 65 back in 89 the valley was filled with sludge. Kathys dad always used Quaker State. My 2c, I wouldnt use Q-State or Penzoil.

When I was still at Ford dealership they came out with update to use 5w30 in Ford engines from around 90 to current. To thin for my liking.

David

------------------
David & Kathy Bowers
1982-1993 Mustang GT Registry
www.mustanggt.org (http://www.mustanggt.org)
1965 Mustang coupe (http://www.mustanggt.org/bowers/index.html) (stock)
1985 Mustang GT hatchback (http://www.mustanggt.org/bowers/index.html) (daily driver)
1991 Mustang GT hatchback (http://www.mustanggt.org/bowers/index.html)(open track/autocross)
1991 Mustang GT convertible (http://www.mustanggt.org/bowers/index.html) (acquired 5/31/01)
1998 Expedition (family hauler & tow vehicle)



[This message has been edited by MustangGTorg (edited 07-18-2001).]

Big K
07-19-2001, 10:18 AM
Car fanatics are less likely to argue about religion and politics than motor oil ..... but here's my opinion anyway.

Originally posted by ELECTRA:
Synthetic has "marginal" benefits that, to me,does not justify the price. I would rather have more frequent oil changes then a motor full of old,dirty,(pricey),synthetic any day.

Synthetics are certainly pricier than dino oils, but the major benefit of synthetics is that the manufacturer can control the purity of the oil. Well made synthetics do not contain undesireable hydro-carbon compositions (like tars). Frequent oil changes are necessary with dinos, but not so with synthetics since the "undesireables" aren't present and, therefore, can't break down into dirty, harmful pollutants through normal use. However, all oils including synthetics will break down over time and the lubricating properties will deteriorate. I change my oil every 5,000 miles using synthetic, but I know people who go a lot longer (10k miles!).


Originally posted by 89GT:
...but I have heard that they are thinner or something and can cause leaks if everything is not tip top shape

I think synthetics get a bad reputation for causing leaks. I have heard two theories for this reputation: synthetics have smaller molecules and synthetics will not swell o-rings and gaskets as much as dinos. Therefore, synthetics have a tendency to find existing leaks, but don't cause them. Also, synthetics act as a dissolver of dirt and "lacquer" left by dino oil, and I think that's a good thing. But whatever you choose, change it regularly and keep everything in tip top shape.