baddog671

Last (and first) oil change I did Amsoil XL 5w20 with Mobil 1 filter. Going to switch to Amsoil 0w20 and stick with Mobil 1 filter here in the next few days. Ran the 5w20 stuff 6000 miles and still is golden

.boB

There's nothing wrong with standard Penzoil, it's a fine product.

A full synthetic has two distinct advantages over standard dino oil. It can handle a lot of heat, which is good when you're racing. And you can significantly extend the drain intervals. If you're not interested in either of those qualities, stick with regular dino oil and change it according to the owner's manual. My '08 V6 calls for every 7,500 miles.

As far as synthetic oils, there are only 4 true synthetics on the market. And Mobile 1 is not one of them.

Nuke

Your engine cane from the factory with Motorcraft 5W20 synthetic blend. Any good brand oil will do. I've put over 200,000 miles on at least 4 vehicles using various name brands of dino oil with not one burning or using oil.

Personally, I use Amsoil 0W20 in my GT, Motorcraft blend in the g/f's Stang and I use Mobil1 in my tow vehicle.

Saleen 05-055

+1 FTW! Mobile 1 all the way.

svtsupremecy

Just because it has a pennzoil sticker does not mean it was using pennzoil. Read the sticker for "oil type." If you go to a pennzoil quick lube, they just use the pennzoil oil "reminder" stickers in most cases...
if it says:
5w20 ....probly ****ty bulk oil
something like GTX or PZ 5w20 then it was castrol gtx or pennzoil

basically you want it to say anything except just "5w20" because chances are it was getting ****ty bulk (cheapest) oil.

ronniegibson1978

i'm running castrol edge right now...and its helped calm down the valve chatter after getting cams put in

Budco

I agree with .boB. I've been a fleet master mechanic for over 30 years, been to more factory schools than I can remember. Synthetic is great if your going to abuse your oil. If you use it for everyday driving and change at regular intervals, dino is fine. We've gone over and over this topic on some Harley forums and everyone has an opinion, that's why they sell so many different oils. I do run Amsoil in my Harley because the engine's air cooled and the oil does get abused.... You would be surprised the difference in oil filters but that's another story. Some of the one's you think are good, well just aren't. Just marketed right....
Keep it between the lines...

washburn085

I usually use Mobile1 full synth 5w-20. Today I took my 07 Gt into Ford for the 30k mile maintenance (I didn't want to deal with replacing the fuel filter myself), and I noticed that the receipt said mobile1 full synth 5w-30. Not sure if they thought it was a pony car or if they went higher because of summer? I live around DC, so it doesn't get crazy hot around here.

Doubt it will hurt anything, the engine is still stock. Next change I will go back to my Mobile1 5w-20.

mstngsule68

the basic ford synth blend along with the motorcraft filter... like someone says it last 5k, plus i really dont care as long as it keeps my lifetime warranty intact lol.

algregory

Amsoil 0 wt 20. plus 6 oz. Tufoil. Been using Tufoil for years. I have the 5 Speed, use it in there also.