i got a new 5.0 motor for my 1990 mustang and i want to use ams oil synthetic. what viscocity is recomended for a street / strip car. the motor is all stock, port polished E7 heads and gt40 intake. Is there anything i can do to prevent the rear main seal to start leaking, because i know its coming.
oil choice
- Thread starter flmustang
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88mouse
New Member
If its a fresh rebuild you don't want to run synthetic in it. You need to break it in on reagular motor oil.
squeak93
15 Year Member
samickguy15
Member
Diesel oil AKA Rotella (per squeak93) is very good break in oil. IIRC, one of the major cam manf. reccomends using it...
bynummustang
Seen my other Jackstand?
WHITE94COBRA
New Member
Regular dino oil for break in, really any regular oil will do, lower viscosity obviously. I personally stay away from pennzoil
crane cams is the company that recommends diesel oil for break-in. They recommend a couple brands, Delo-400 being one of them. I just used the Delo-400 to break in my solid flat tappet 347, and it broke it great without any problems. I have actually heard that it's best to run the diesel oil all the time, and that's what I plan on doing. It's 15W-40, but my engine is setup with loose bearing clearances, so it's a good idea for me anyway. Costs a lot more, but worth it IMO.
onefstsnake
New Member
Hell I ran Castrol GTX for 2 years and this year ive been using Mobil 1 Full Syn.
I have always used the Mobil 1 filters, bigger and heavier than almost anything out there lol
I did buy a couple cases of Valvoline VR-1 though.
I have always used the Mobil 1 filters, bigger and heavier than almost anything out there lol
I did buy a couple cases of Valvoline VR-1 though.
I've been using Castrol GTX in all my vehicles for many years and never had an oil problem and never heard of anyone ever having a problem because of it so I will continue with it. In a motor that is new or has a bunch of money in it I would have to recommend Synthetic Oil though w/ Motor Craft filter. Does anyone run synthetic oil with lucas ?
Shakerhood
15 Year Member
My G/F just bought a brand new Jetta, I was reading through the Owners Manual and it actually calls for 5W-40 Diesel Oil even though it is gas powered.
mustangfan1990
New Member
Shakerhood
15 Year Member
hollywoodstang
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- May 23, 2006
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Shakerhood
15 Year Member
They changed their Formula a few years back, you can Google it and find numerous discussions, here is one. Its seems like all Companies are constantly cutting quality for money.
http://www.fatwallet.com/t/18/742332
hollywoodstang
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90blacknight
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Its a group 3 oil like castrol syntec, mobil 1 and pennzoil platnium. It will be fine, they're still better than regular oil. I personally run mobil 1 in both of my cars, 0W40 Euro formula in the Audi and 10W30 in the Mustang.
