Stay far away from it. Multiple UOAs from GT500s has shown elevated levels of lead wear. This is likely due to it maintaining a 50 grade viscosity, shearing less than any other 5W-50 formulation.
Stay far away from it. Multiple UOAs from GT500s has shown elevated levels of lead wear. This is likely due to it maintaining a 50 grade viscosity, shearing less than any other 5W-50 formulation.
Thanks for the great info and links. So is only amsoil and rp group 4 base?
i know i can get amsoil locally from fleet farm, but i know there are may different variations or types of sub categories of amsoil. What type should i be looking for or where should i be getting it. I guess i will be switching soon. I just did a 1000 mile oil change with mc5-50 and didnt even think about it. I will probably change out my dads corvette as well when time comes. Would the same oil and rating apply to him?
I live in mn and will be driving my car march or april til november or december. I could possibly get to freezing or below a few days on each end of when i have the car out. Should that be a concern using 10-30 for just a few days. The car will be in an unheated garage but i suspect the garage will be 40 or so at that time of year.
Since the road runner motor is high revving you need the extra 50 weight protection. Which also has different heat absorbing characteristics than lighter weight oil.
Tampering with the weight and brand just because some ferrari yuppie did it or because you only toot around town is ignorant. Just do it right and be safe. This is a real no brainer and shouldn't be over analyzed.
Here we go again. There is always someone who ignores facts about what MC 5W-50 can, and can't do. Road Racing lubricant spec's someone would pay the most attention to is High Temp / High Shear.
50 grade lubricants have a virgin HT/HS spec of ~5.0
40 grade lubricant have a virgin HT/HS spec of ~4.3
30 grade lubricant have a virgin HT/HS spec of ~3.2
20 grade lubricant have a virgin HT/HS spec of ~2.8
HT/HS is the viscosity of a lubricant when it reaches 150*C (302*F). i.e. the temperature of a lubricant around the pistons during long session racing conditions. Having a higher HT/HS is desirable for road racing. Unfortunately, MC 5W-50 will never maintain a 5.0 HT/HS. The viscosity improver polymers rapidly shear on average 35% in this formulation, resulting in HT/HS lower than 4.0
Amsoil 10W-40 will maintain it's viscosity, leaving you with a higher HT/HS for better protection while long session road racing.
Also, lighter grade lubricants will dissipate heat more rapidly than more viscous lubricants. Lower heat means a higher viscosity is maintained overall.
darreng505, need I remind you that the Ferrari guppy you are referring to has a Ph.D in chemistry, specializing in tribology? No offense, but you are taking Ford's recommendation as gospel while ignoring facts that suggest otherwise. Numbers do not lie, businesses selling their proprietary products for profit potential do.
Comment on voiding the warranty.
If U have an engine or driveline failure, how could the dealer tell what oil is in the motor unless U tell them?
Unless they send it to some lab for an analysis which is unlikely.
Has anyone looked into the Lucas oil offerings?
Lucas Synthetic High Performance Motor Oil : Lucas Oil
http://www.lucasoiloffroad.com/lucaspdf/TDS_Syn-SAE_5W-20.pdf
What weight Pennzoil Ultra would you recommend for a '13 Boss that is primarily used for sunny weather cruiser, backroads corner carver with some spirited driving, and some very light drag strip use. Currently sitting at 950 miles & still have the original fill Motorcraft in.
What you should know about Motorcraft 5W-50 is that it shears rapidly. That means it "thins" to a lighter SAE grade in a very short period of time. Every sample submitted was already a light 40 grade in 1,500 miles of use. Some samples with more miles sheared to a very heavy 30 grade lubricant.
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Even the best 5W-50 grades shear, which is one reason why Amsoil will not formulate one. Red Line seems to have the best anti-shear resistance of all 5W-50 formulations, however, in the GT500 engine....it has shown excessive levels of lead ppm wear. Not good!
Well, okay, but doesn't this mean that Motorcraft 5W50 is a bad idea in the GT500? After all, it is 50 weight initially, is it not?
Would that not mean that we should expect to see elevated lead in the UOAs of those GT-500s that are running on Motorcraft 5W50, though not as much as for RL?