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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 04-11-2010, 01:38 PM
Offroadracer426 Offroadracer426 is offline
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can i use 10-40 in my 91 f150 V8 5.0L

I wanna know if i can use high milage 10w 40 for my 1991 F150, its a v8 5.0L
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Old 04-11-2010, 01:52 PM
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Originally Posted by Offroadracer426 View Post
I wanna know if i can use high milage 10w 40 for my 1991 F150, its a v8 5.0L
that's what I use in my 1990 302~~~~have been for over 8 years now -she's a leaker
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Old 04-11-2010, 02:12 PM
Offroadracer426 Offroadracer426 is offline
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Quote:
Originally Posted by jr32560 View Post
that's what I use in my 1990 302~~~~have been for over 8 years now -she's a leaker
how many quarts should i use all 6 or 5 and a half, mine leaks too, i gotta do my rear main seal
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Old 04-11-2010, 06:25 PM
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Use 6. And of course you can use it. It's just a little thicker at operating temp than 10W-30. Same thickness at startup.

My Supra has 10W-40 in it right now, and calls for 10W-30. Used it after someone said it'd help with the lash adjuster (lifter) noise. The 5M engine is known for being noisy and the thicker oil helped quiet it down.

Thicker oil harder to pump more work for the engine and more protection. Thinner oil the opposite.
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Old 04-11-2010, 07:01 PM
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for summer that is fine but not for winter in ny.
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Old 04-11-2010, 07:05 PM
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Originally Posted by DreadyDiggs View Post
Use 6. And of course you can use it. It's just a little thicker at operating temp than 10W-30. Same thickness at startup.

My Supra has 10W-40 in it right now, and calls for 10W-30. Used it after someone said it'd help with the lash adjuster (lifter) noise. The 5M engine is known for being noisy and the thicker oil helped quiet it down.

Thicker oil harder to pump more work for the engine and more protection. Thinner oil the opposite.
USE 1 QT of Lucas oil stabilizer w/ whatever oil you use!
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Old 04-12-2010, 12:28 AM
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Originally Posted by ymeski56 View Post
USE 1 QT of Lucas oil stabilizer w/ whatever oil you use!
I've never added anything to any oil I've used. Lucas is some thick stuff, maybe it does it's job better than just upping your oil weight, maybe it don't. I haven't used it. But the folks that use it and Slick 50 and the like swear by them haha.

I'm gonna pour seafoam in my oil and drive about 50 miles before draining it, and see what that does, and that'll be the first additive I've ever put in my oil besides what comes in the quarts of oil themselves.
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Old 04-12-2010, 02:50 AM
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Use 10-40?? Go BIG!!

1995 F-150, 155k for miles;
5.0, Auto, 2 wheel drive.

In the Winter (in Southern California) I use 6 qts of Castrol 20-50, and for the Summer, trips to the Desert, etc, I use Valvoline Racing 50 wt, 5 qts with a measured top-off of Lucas Treatment.

Change the filter ONLY, fill the new one with LUCAS, and continue. I only change oil 3 times a year. No rattle, no lifter tick cold, and I'm hoping for another good year. This is my Company Truck, and Home driver too.

Bearings get worn; Motors get hot. I have 33" BFG's, and didn't re-gear. (my fault) But she still starts and runs quiet, thru the muffler!
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Old 04-12-2010, 02:50 AM
 
 
 
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