questions on synthetic oils

[Recon]

I have certainly had doubts regarding synthetics vrs standard conventional oils. I used Havoline in a Mustang Gt I recently owned. It ran very smooth and I had no problems what so ever. I CHANGED OVER TO SYNTHETIC after about 4 months of owning the car due to the major hype ( less wear, friction, etc.) To be honest with you aftter 1 year I started having motor troubles , most likely not the oil but ? My parents have used Havoline for ever in their cars their 74 dodge has 300,00 + on it and has never been torn down. I have alway been told that once you go to Synthetic you cant change back is this true ? I started using mobil 1 10 w 30 in my wrx after the 1st oil change. It feels a bit more sluggish to be honest with you since I changed. I also here a slight tick sound when it is cold ( which I never heard with the original oil from the Factory) I feel that if it is safe, I will probably change back to Havoline ( It is definately the best oil I have ever used. My brother uses Royal Purple and swears by it but hell where do you find it in hick vill U.S.A.
Any help would be appreciated I have alway been told that once you go to Synthetic you cant change back is this true

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[WRC1]

the problem is not the oil....the problem is that you got a ford

[rexaroo]

Your current WRX NEEDS a good synthetic oil to lube those turbo bearings properly when they get really hot--conventional oil just won't cut it--Redline 5 or 10W30 is really excellent for the Rex. Royal Purple is good too if you can find it. Mobil will be coming out soon with their special synthetic racing oil 0W30 that all the race teams use. The ticking sound you hear with the Mobil is nothing to be concerned about--synthetics don't have wax or other natural impurities in them, so they are thinner and you hear a little more engine noise sometimes.

You CAN switch back to conventional if you want. The only thing that will happen is your engine and turbo will wear out faster.

[DrD]

Originally posted by Recon
I have alway been told that once you go to Synthetic you cant change back is this true

That's not true with modern synthetics - in the "old days" the synthetics were much less compatable with conventional oils, so mixing the two wasn't a great idea - not the case now (in fact, most synthetics even have a little blurb written on their package somewhere stating that they are compatable with conventional oils)

[Mike Wevrick]

Also, you should be using 5W30 for better start-up lubrication, especially in the winter in Indiana.

[Recon]

I Appreciate the reply