Originally Posted by Whitehorse10

They say you can't put a price on peace of mind. I've used the mobil 1 and the valvoline synthetic. The advantage of synthetics is that they offer a little better protection when you start the engine after it has been sitting for awhile, i.e. in the morning. As far as normal operation once the engine is warmed up there is no difference. Synthetics are also better in extremely cold weather.

Originally Posted by Whitehorse10

After years of trying this oil and that, synthetic and conventional I now just take mine to the dealer and let them put Motorcraft semi-synthetic in it and a motorcraft filter. The differences from one oil to the next are so small that it's not worth all the effort in these engines. If we were running a much more precise engine like you find in an Porsche or some high end car like that it would be different but the Mustang engines were designed to run on the less expensive stuff and use the cheapest gas. Getting all worked up about the oil and putting high grade synthetic in your Mustang is like putting an NFL linebacker on a liquid diet. The Mustang is a tough, rugged and well built car that is designed to run on Valvoline or Penzoil or even (dare I say it) Quaker State with no problem. Yes using the better oil might be better for your car but in the greater scheme of things is it really worth the money? I've seen the 4.6 motor in F150's last for 250 thousand miles or more with owners that put the cheapest oil they can find in them. Likewise the 4.0 V6 was designed to practically run on bilge water and keep going. Motorcraft works fine and I'd be willing to bet my car still lasts for 200K with no problems. To each his own though, variety is indeed the spice of life is it not.

PS, one study actually showed that the Wal-Mart brand oil filters were better than almost any other filter on the market. lol So much for high end.

Originally Posted by JCON

I use to go to 10k on my Passat with AMSOil and it wasn't dirty, it was just thin.

At 7500 with Mobil 1 in my Mustang, it's black and nasty.

Next change I am going back to AMSOil

Originally Posted by Whitehorse10

After years of trying this oil and that, synthetic and conventional I now just take mine to the dealer and let them put Motorcraft semi-synthetic in it and a motorcraft filter. The differences from one oil to the next are so small that it's not worth all the effort in these engines. If we were running a much more precise engine like you find in an Porsche or some high end car like that it would be different but the Mustang engines were designed to run on the less expensive stuff and use the cheapest gas. Getting all worked up about the oil and putting high grade synthetic in your Mustang is like putting an NFL linebacker on a liquid diet. The Mustang is a tough, rugged and well built car that is designed to run on Valvoline or Penzoil or even (dare I say it) Quaker State with no problem. Yes using the better oil might be better for your car but in the greater scheme of things is it really worth the money? I've seen the 4.6 motor in F150's last for 250 thousand miles or more with owners that put the cheapest oil they can find in them. Likewise the 4.0 V6 was designed to practically run on bilge water and keep going. Motorcraft works fine and I'd be willing to bet my car still lasts for 200K with no problems. To each his own though, variety is indeed the spice of life is it not.

PS, one study actually showed that the Wal-Mart brand oil filters were better than almost any other filter on the market. lol So much for high end.

Originally Posted by JCON

I did 10k on my Passat but I started with AMSOil at 99k miles.

My uncle who is a diesel mechanic for the state of NY has friends at his shop who started AMSOil from the dealership and they go 20,000 before changes. I think that's a bit long but at 10k I had no issues other than the thinning of the oil. Same color coming out as it was going in.

It's expensive though.