I know this has been beat to death, just curious if everyone is still running 5w-50 oil? My personal "mustang guy" mechanic says only 5w-30 is needed and that the 5w-50 is just for ford to have a bit of insurance if we drive off the lot onto the track. Plus worst gas mileage. Could it void my warranty running the different weight? Thoughts?

 

Use what is in the book, I think the only cars they suggest/require to run 5/50 is the Boss and GT500.

 

Track pack is 5w-50, just want some opinion's from other track pack owners.

 

**** forgot it has the Boss cooler and what not. I would use 5/50 then since Ford recommends it but then go to Mobil 1 or something better than the Motorcraft stuff. People have also said that 10/40 Amsoil is really good because it won't shear like the 50 weights. And on the warranty, if they can prove it caused the failure or probably if they know you put something other then recommended in, they might void it.

 

Stick with 5w-50. I just had mine done at the local dealership. Its not cheap but car runs great. I have had no problems.

 

I have 9400 hard driven miles on mine, mods done at 700 miles, and no issues using the recommended Ford oil. Unless your mechanic is a retired Ford engineer, I would stick with the people who built the motor...of course everyone knows better than them if you read any forums, lol.

 

It would only make sense that the people who built the motor and know it's tolerances would know nothing about it in actuality.

 

I've spent a good two days reading the forums about oil since buying my Mustang. Fair warning; there seems to be little else that can start as big a debate/fight than oil threads. That said, what I've read indicates that Motorcraft 5w-50 quickly shears down to a 40 weight oil, and eventually to a 30, if you run the full change interval.

If you're worried about your warranty, use the recommended MC 5w-50. In a daily driver it's going to shear down to a 30 weight soon enough anyway.

If you're going to switch to a top-teir synthetic, that won't shear, I'd be worried that a true 50 weight oil is thicker than you really want. I'm not sure I'd drop all the way to 20 weight though, which seems awfully thin (and EPA-triggered).

I'm strongly considering switching to a high quality 5w-30 or 0w-30 for my daily driven GT.

 

I switched from the factory-fill 5w50 Ford oil to Amsoil 10W40 XL oil at 5,000 miles, now at 10,100 I switched again to BND Automotive's "QuantumBlue" custom-blended oil ... they made a formula for me in a 12.5W43 weight, especially formulated for my engine, my driving conditions, and my temps/weather.

I used their 8w35 in my '07 Charger Hemi 5.7 and loved it there ... it stayed clean well over 5-6,000 miles, and at 7800 miles the used-oil-analysis said I should try a 9k-mile interval next time, it was still that good.

I plan on draining this 12.5w43 at about 17,500 and sending out a sample for analysis.

 

5w-50

 

Thanks for the input guys, ordered me some Mobil 1 5w-50 while it was still on sale, was just curious.

 

I use Mobil 0w40 euro.

 

What do you mean by this? Are you saying you use the 0W40 that is meant for Euro cars?

 

Yes, if it was good for my twin turbo BMW it will definitely be good for my track pack.

 

I've been reading bobistheoilguy in regard to Pennzoil Ultra and the new gas to liquid formed base oil having tremendous resistance to shear and volatility. It seems to be a great choice but 0w40 is the closest they have and it is hard to find. The 0w40 is recommended for Chrysler SRT motors. I can't help but think the 5w30 would be fine for track pack cars for daily driving.

 

Wally World now has the 0w40 Mobil in 5 quart jugs. I picked some more up yesterday for $24.xx a 5 quart jug.

 

That is the worst thing you could do is change the weight of the oil, you need to run whatever the book says there are many things inside the engine that depend on the weight of the oil. Timing chain tensioner, and the internal tolerances of the motor is designed to work with the oil that is recommended from the factory. Changing from 5W-50 to 5W-30 can cause harm in the timing components. Change the oil when you're supposed to and run the recommended oil and it will last forever.

 

This guy has no clue what he's talking about. I run Gatorade orange flavor, I'm golden.

 

grape has the royal purple additive nets you 5rwhp and 5 more mpg ... dont you no ANYTHING about what oil to run ... noob.

 

Regular GT calls for 5W-20, Track Pack calls for 5W-50. Do you really think Ford builds separate Track Pack-specific engines with different timing chain tensioners and such...I doubt it. Track Pack cars likely get the same exact engine as non-Track Pack cars just with a different oil cap.

I had a UOA done at my first oil change, and Blackstone confirmed that after ~5000 miles the 5W-50 sheared down to a light 40W.

My opinion is that Ford fills with 5W-50 because they're selling you a car that is ready to be driven on track reliably right from the showroom.