15W-50 too thick??

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Mar 31, 2004 | 10:56 AM

99PTA

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From: Deer Park, Tx

15W-50 too thick??

I waswondering if Mobil 1 15W-50 was thick of an oil on a basic bolt on Trans Am?

Mar 31, 2004 | 11:29 AM

Steve - Race Eng

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From: Oceanside, Ca.

viscosity

Quote:

Originally Posted by 99PTA

I waswondering if Mobil 1 15W-50 was thick of an oil on a basic bolt on Trans Am?

Use a lighter weight. Clearances are tight on these engines - they are designed for 5w30. A 15w50 will take longer to thin out on cold start and get to critical areas of the engine resulting in greater wear. Gas mileage will suffer also from the increased rotating friction a higher viscosity oil.

Steve
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Mar 31, 2004 | 11:39 AM

Noyzee

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From: East Side Performance! mASShole

id use a 5-30 or st 30. unless you get a different pump.
i run 50 wiegt in my car

Mar 31, 2004 | 12:39 PM

99PTA

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From: Deer Park, Tx

A local oil place..... suggested mobil 1 10w-30. is that good or shoudl i just get 5-30

Mar 31, 2004 | 12:43 PM

Assassin

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From: Nevada

castrol GTX 20/50 here!

Mar 31, 2004 | 12:57 PM

SSCamaro99_3

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From: Ballwin, MO

I was running a mixture of Mobil 1 0W-40 and 15W-50. 4 parts to 2. Did the same substituting 10W-30 for the 0W-40. I am switching to Redline 10W-40.

Mar 31, 2004 | 01:22 PM

PlainwhiteZ28

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From: Fort Davis TX

unless you have a powerstroke in your car, Id stick with 5w30 or 10w30

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Mar 31, 2004 | 02:38 PM

antz01ta

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From: Ne Pa

Quote:

Originally Posted by PlainwhiteZ28

unless you have a powerstroke in your car, Id stick with 5w30 or 10w30

or a stroker motor that runs 2.5 - 3 thousandths bearing clearance.

Mar 31, 2004 | 02:43 PM

#10

stealth

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I assumed one could tell from my sig that, since I am using Lunati, I was running ~.0028 to .0030 main bearing clearance. THey recommend .0030 out of the box.

Mar 31, 2004 | 06:21 PM

#11

Damian

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From: Atlanta

15w50 would be ok for a high mileage motor that see's a lot of abuse. IE: 90-100K+ miles. A buddy of mine runs 20w50 in his 98 motor w/ 125K on it, sprays it daily with no problems.

10w30 at the very least. 5w30 is way to thin IMO, that **** is almost like water before heating up...

I used 10w30 Valvoline in my 98 shortblock from day one, beat the living **** out of it for 40K miles, and upon teardown my internals looks almost brand new. Bearing wear was almost invisble...

Mar 31, 2004 | 10:37 PM

#12

ataylors

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From: Bay Area, CA

It also has alot to do with what your climate is like. I have been running Mobil 1 15-50 in my Grand Prix GTP since 98 with no troubles

Mar 31, 2004 | 10:39 PM

#13

sickfive55

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From: The bay, cali

i use amsoil 0w30 is that bad? my car runs good...

Apr 1, 2004 | 12:08 AM

#14

jimmy 2 Times

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From: norristown PA

i was told that i should run 4.5 quarts of 5w30, and 1 quart of 15w50, what is the advantage of this?

Apr 1, 2004 | 04:43 AM

#15

Patman

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From: Mississauga, Ontario

15w50 is too thick, go with 0w40 instead. The LS1 likes a thick 30 to thin 40wt oil.

Apr 1, 2004 | 10:43 AM

#16

Glenn98ZM6

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From: DFW, Texas

realize that M1 is on the thin side compaired to the same viscosity of Dino oil. i also run 15w-50 M1 in my car. and i have for well over a year or so. my car is used for road racing and spends lots of time above 5K (like 20 minutes straight). i use this wieght to fight the thinning of the oil due to temp (was 300 degrees + before the oil cooler). just be smart and let the car idle for a minute before you drive off.