Engine 88 got oil question

C

Comp Cam

Member

Jan 11, 2019

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8

Lenexa,kansas

Mar 6, 2019

#1

• Mar 6, 2019

• #1

What's up, so it's time to change the oil in my GT. It's HCI bigger throttle body rockers and Pushrods with gt40 heads. For some odd reason he used 20w 50 racing oil in it for a recent oil change (before I bought it). Unless he's trying to hide unwanted noise (witch I fear). Should I go ahead and use 10w 30 or stick with w20 50 instead?

 

RaggedGT

Been here over a DECADE and still no CT

Mod Dude

Jul 20, 2014

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#2

• Mar 6, 2019

• #2

I would say pick your favorite flavor of a oil and go for it.

 

C

Comp Cam

Member

Jan 11, 2019

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8

Lenexa,kansas

Mar 6, 2019

#3

• Mar 6, 2019

• #3

RaggedGT said:

I would say pick your favorite flavor of a oil and go for it.

Click to expand...

Ha I knew I would get an answer like this. But seriously tho would you recommend using 20w 50 in a 5.0?

 

RaggedGT

Been here over a DECADE and still no CT

Mod Dude

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#4

• Mar 6, 2019

• #4

20w50 is a little on the thick side,but No,I wouldn’t have an issue running it. Is the current oil conventional oil, or some super fancy racing branded oil?

 

C

Comp Cam

Member

Jan 11, 2019

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Lenexa,kansas

Mar 6, 2019

#5

• Mar 6, 2019

• #5

RaggedGT said:

20w50 is a little on the thick side,but No,I wouldn’t have an issue running it. Is the current oil conventional oil, or some super fancy racing branded oil?

Click to expand...

It's just conventional

 

C

Comp Cam

Member

Jan 11, 2019

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8

Lenexa,kansas

Mar 6, 2019

#6

• Mar 6, 2019

• #6

RaggedGT said:

20w50 is a little on the thick side,but No,I wouldn’t have an issue running it. Is the current oil conventional oil, or some super fancy racing branded oil?

Click to expand...

Should I step down to 10w 30?

 

RaggedGT

Been here over a DECADE and still no CT

Mod Dude

Jul 20, 2014

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#7

• Mar 6, 2019

• #7

I think either way you will be fine- fwiw I run 10w30 in my ‘94.

 

JD1964

there is enough sticking out to grab on to

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#8

• Mar 6, 2019

• #8

Some engines are built with slightly more bearing clearance for racing purposes. I dont have a technical explanation for why. The 306 in my 93 vert was built that way by a previous owner. If I run 10-30 in that motor, hot idle pressure drops too low for my liking. So I run 20-50 Mobil1 full synthetic and its perfect. My 92 was built with factory spec bearing tolerance and I run 10-30 in it.

 

Wayne Waldrep

Before I post a pic, do you have one of yours?

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#9

• Mar 6, 2019

• #9

My original engine went 248k miles. All it ever had in it was Castrol 20w-50 conventional. Like has been said above, either is fine.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

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Mar 7, 2019

#10

• Mar 7, 2019

• #10

Can you put a good oil pressure gauge on the car and see what you have for pressure now, and then see what you have if you change to 10W-30? That will likely give you the answer you need once you see how the different oil affects pressure (either cold or hot)

 

mikestang63

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Aug 27, 2012

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Mar 7, 2019

#11

• Mar 7, 2019

• #11

as long as you dont live in a cold climate, you can run it fine. Just to throw you a curve ball, I've been running Rotella 15w40 in my N/A fox body cars for decades and 20w50 castrol in my supercharged ones.

 

JD1964

there is enough sticking out to grab on to

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#12

• Mar 7, 2019

• #12

Correction. Above I said I run 20-50 Mobil1. They dont make it. It's 15-50. Doh!