cslix

Hey was just wondering what you guys recommend for an automatic 4.0 with 100k miles.. what oil what fuel cleaners so forth.. cars stock btw.

JimC

I used Mobil 1 first the 50/50 blend and when they stopped making that went to the synthetic. Didn't use any fuel cleaners; too risky on a car with forced induction.

The car had 203,000 miles on it when I sold it, had been run with a 75 shot of nitrous for two seasons, then at 90,000 miles pulled the nitrous and put the Xcharger on it. It was still running mid 12's at the drag strip. The new owner says it runs great and he is getting some drag radials and will be taking it back to the track too.

Nuke

I'd stick with either the factory 5W30 synthetic blend and a bit less than the Ford-recommended 7500 mile changes (I use the Motorcraft blend in the wife's V6 with 5000 mile changes) or use a full synthetic at 10,000 or more miles; just be sure to use a filter that can handle the extra mileage like an M1 or Amsoil filter. Most any brand name will do well. And if you don't mind spending more, you can't go wrong with Amsoil full syn.

As far as a fuel system cleaner, I add Techron to the tank around each oil change; about every 10,000 miles. I sell or trade most of my vehicles after 200,000 miles and they all run great under those oil change and fuel system cleaning frequencies.

Ihateyourface

x2 for the Techron. I have an 07 with only 20k miles on it and averaged 18.5 MPG. Added Techron and it went up to 19 MPG+.

cslix

Thanks i think ill try that stuff.. i just put stp fuel cleaner in it so will see how it runs next fill..

flyhigh@mach1

Mobil One full synthetic.....good stuff. Any synthetic or 50/50 synthetic will protect your cars engine if you change it at the right intervals.

cslix

what do you think the best full synthetic oil is for its money? mid range price but awesome stuff? how many miles do you suggest changing it at.. my car currently has 109k miles about 100k highway.. now i just use it local

Nuke

I like and usually use Amsoil in my Stang but have gone to Pennzoil Ultra due to the high price of the Amsoil but more because I'm down to about 3,000-5,000 miles/year on the Stang and even synthetic shouldn't be left in the crankcase much beyond 1 year. Mobil 1 is a very good oil. Any major brand will do as long as you change it at a decent frequency and use a filter taht can handle the capacity. M1 filters are decent. So is the OE Motorcraft oil filter but I'd change the Motorcraft after no more than 7-8k miles. Unless you're really driving under some severe conditions, 10k miles on a good synthetic is easy.

03gt04mach1

If your NOT using any oil between changes, stick with what you've been using. The only Fuel additive I've ever used is a new Fuel Filter every couple of years. You shouldn't need an additive.

cslix

idk what this means but im gonna be putting in techron every oil fill.. maybe 8k miles..