What's the best oil?

JT929240 · Jul 29, 2010

i have a 91 gt the motor is being rebuilt right now and i bought a v-1 s trim vortech to put on it. I am definitely going to use synthetic oil just wondering which is the best oil to use? i always see royal purple being promoted like its the best but i am not sure which one to use?? Any suggestions?

MR 5.SLOW · Jul 29, 2010

napa synthetic baby

SoCal89GT · Jul 30, 2010

Mobil 1. its used in all sorts of racing for a reason

Mustang5L5 · Jul 30, 2010

Amsoil, mobil 1, castrol synthetic

I personally wouldn't use royal purple. Moly based lubes tend to gunk and are more suited towards race engines which are frequently torn down and rebuilt between races.

347HO · Jul 30, 2010

Royal Purple

bgdowski · Jul 30, 2010

Amsoil...

Im not too fond of Royal Purple either.

347HO · Jul 30, 2010

I drove my race car to the track twice a week for 3 years.
Never had an oil issue that was Royal Purple's fault.
I changed my oil every 2000 miles or when I needed to service a part within the oil system.
My "street car" ran 10.20s. I believe in Royal Purple. Is it the best? Who knows, but I'm not going to switch until it fails me.

My bearing clearances, bearing crush, std rings, temp and level were maintained. Anything can fail if you abuse it.

NIKwoaC · Jul 30, 2010

Personally, I don't see the sense in running any oil that you have to special order or anything that costs twice as much as anything else out there. Valvoline full synthetic or Mobil 1 here. Pro-level lubrication that you can buy at Wal-Mart FTW.

icemant180 · Jul 30, 2010

SoCal89GT said:
Mobil 1. its used in all sorts of racing for a reason

+ 1

Shaolin Crane · Jul 30, 2010

aar0s · Jul 30, 2010

another vote for mobil 1. best price is probably going to be at wally world.

JT929240 · Jul 30, 2010

ok so i will probably go with mobil-1 then what about the weight 10w30?

93fox5.0 · Jul 30, 2010

i wuld use royal purple break in oil specifically for breaking in new or rebuilt motors

JT929240 · Jul 30, 2010

how many miles are you supposed to use that oil for? And after can you switch to mobil 1 or do you still have to use royal purple?

93fox5.0 · Jul 30, 2010

no u can switch just keep full synthetic and idk how many ur supposed to run it for maybe like 500 or something just go look it up im sure it will say but i heard nuttn but good about it and the guys on horsepower tv use it wen the first dyno a motor or get done building a motor and its the only oil i kno of thats specific to break ins

93fox5.0 · Jul 30, 2010

also if ur gonna switch i wuld recommend mobil 1 for sure and probly 5w30 or amsoil is amazing stuff

NIKwoaC · Jul 30, 2010

Break in your engine HOW YOUR BUILDER TELLS YOU TO. A good builder will tell you what oil to run and how to do it. You'd be better off asking him than asking a bunch of anonymous people on the internet. He'll also tell you what weight to run. Just in case though, Ford specified 10W30 for these cars. Look in your owner's manual.

93fox5.0 said:
no u can switch just keep full synthetic and idk how many ur supposed to run it for maybe like 500 or something just go look it up im sure it will say but i heard nuttn but good about it and the guys on horsepower tv use it wen the first dyno a motor or get done building a motor and its the only oil i kno of thats specific to break ins

You have to take that stuff with a grain of salt, man. Those guys get PAID to tell you that stuff. They'll also tell you that buying an electrical gizmo that wires into your chassis will keep your car from rusting, or that some magical fluid will make your 200,000 mile car run like it was new.

93fox5.0 · Jul 31, 2010

i said i heard nuttn but good about it AND they use it im fully aware they only do it cuz they get paid haha but they did use it in that mustang they gave away and i bet that person aint complaining haha

Shaolin Crane · Jul 31, 2010

NikwoaC said:
Break in your engine HOW YOUR BUILDER TELLS YOU TO. A good builder will tell you what oil to run and how to do it. You'd be better off asking him than asking a bunch of anonymous people on the internet. He'll also tell you what weight to run. Just in case though, Ford specified 10W30 for these cars. Look in your owner's manual.

You have to take that stuff with a grain of salt, man. Those guys get PAID to tell you that stuff. They'll also tell you that buying an electrical gizmo that wires into your chassis will keep your car from rusting, or that some magical fluid will make your 200,000 mile car run like it was new.

I wouldn't trust anyone that texting types much less read everything they posted.

347HO · Jul 31, 2010

Holy crap!
Why is someone suggestion oil viscosity set by Ford at the OE level?
I can almost guarantee any new ford engine has way tighter bearing clearances than an after market, machined and built engine.

I agree listening to the machinist who worked the block, but even that should be heeded with a grain of salt.
You, individually should mock up the engine and measure each clearance and then have enough information to base a decision on what viscosity in regards to application, load and clearances. How hot the oil average is, is a huge factor.

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