Your partly right, It use to be that way , but not anymore. Due to the standards that must be met to be on shelf - synthetics are now "seal safe"

The biggest advantage about synthetics is it's ability to control heat , therefore controlling expansion. Try to make this short - there was a seal problem when syn's first came into the picture , because of this "Ford" upgraded all it's seals (Motor and Trans) attempting to correct the problem. Actually all manufacturers where following this. 1998 all Ford builds had the updated seals. As further developing went forward (SynChem) an advanced synthetic with adjusted properties making it the new standard that is now seal safe for vehicles prior to 98.

Example Mercon V, which has been the most announced.

I have to say somehow Amsoil products kind of cornered the market here with there advanced technology oils, I'm not exactly sure how they did it , but you do get what you pay for here.

Nutshell - All synthetics are safe now or they wouldn't be on the shelf.

 

If it's made it to 174K miles on whatever you're using now, why break what isn't broken?

 

You know, I have heard that "don't switch to synth after x-many miles" thousands of times. Ya'll know from my other posts that I am a major synth proponent. It's the bee's knees as far as I'm concerned.

Anyway, I have talked soooooo many people into running it, I should have bought stock in Mobil 1, or started selling it along with Ams.

I have yet to see _anything_ with a dry motor, regardless of mileage, spontaneously start leaking after switching, not once. Not even my old worn-to-s^^t lawn mower! Now, some seepage, or "wetting", or whatever you want to call it (just some dampness coloration around the seals), is totally normal. I would still call that a dry motor. I have heard the stories a thousand times, but never seen it happen. And I have tons of friends that I have talked into running it with 150, 200k on their vehicles, they never developed any leaks. When I switched the old 98 I had to synth, it had 90k on it. It had 130k on it when I sold it and it never leaked or used a drop, not any.

The only times I have seen leaks after the switch was on motors that were already leaking in the first place REGARDLESS of how many miles they had on the clock. Sometimes those leaks got a lot worse with synth, but if they went back to dyno, the leak slowed to the same rate at which it was leaking before. Well, PAO synth stays thin at low temps. It doesn't thicken up anywhere near as much as dyno, the viscosity is just a lot more stable at all temps, and of course the thinner oil is going to leak faster.

I can't say if Mobil 1 wasn't seal safe in its earlier versions. I wouldn't know because that would have been before I started using it (about 7 years now). So I suppose it's possible that older versions of their product, if they weren't safe for the seals, could cause older worn seals to give up the ghost and start leaking. Ether that or the whole mess of it is just more BS dreamed up by the hardheaded die-hard dyno freaks.

 

LOL - Now this is a good post ...

 

Is Engine Restore good or bad...I honestly don't know for certain. I bought a can when I was 17 years old and dumped it in to my '85 F-150 w/ 300 six, ~130,000 miles on the clock. Shortly there after, and I mean like 6 weeks tops, I had blow-by around my piston rings. Granted, the motor was about 9 years old at the time, and had high milege, but I still find it ironic that the rings died so shortly after the use of Engine Restore. Never did get around to telling Dad about that...

Just my two cents,
Mike

 

This is where the post by Quintin would apply

 

i looked everywhere to get 5W30 Amsoil. finally found a store that sold it. he only had 4 qts. so i found another store that has only 5W20 and bought 2 qts. will it matter if i mix em? i really don't see how it would. i'm guessing it'll jus make 5W25? lol figured i check here first.

 

I've always used it at every oil change, and had good luck with it. At least, it never destroyed anything... I know serious drag racers that swear by it, and thats why I tried it. In my wifes Jeep (5.2L) I honestly think it helped the compression, but I have no numbers to back that up... Maybe it's just wishful thinking so I don't have to buy her a new vehicle anytime soon...

 

I would be interested in hearing why you decided to CONSIDER trying the Restore? Does your engine use oil? Do you think you have excess blowby, ie compression loss? If these questions were answered, it would put things in a better perspective.

 

masseyman, i've normally used engine restore and didn't have any problems. i jus wanted some opinions, so i know whether it actually serves its purpose or if i was just wasting my money. btw, still haven't gotten any replies on whether or not it's ok to mix 5W30 Amsoil w/ 5W20 Amsoil. jus wondering if it'll make it too thin since it calls for 5W30 from the factory. thnx.

 

It's fine, mixing those weights won't hurt anything so long as it's the same brand and type of oil (don't mix ams and mbl1, etc).