Oil Weight
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Senior User
Joined: Mar 2001
Posts: 118
Likes: 0
Oil Weight
I have a rebuit 351m with 30,000 in my 79 f150. I changed oil recently and instead of the 10w30 I used 20w50 to see if the pressure would increase. Sure enough it did. Maintains pressure all through the range. Seems to run better but that could just be my imagination. I know that the 20w50 is thicker, is it something that I should not have put into my truck, or is it OK to Use?
Laughing Gas
Joined: Jul 2001
Posts: 849
Likes: 14
From: Fayetteville, NC
Oil Weight
I live in NC and I'm running the 20W-50 in my 351M. Haven't had a problem with it at all. Truck seems to like the thick stuff.
Robert
1978 F-150 4x4 Stepside 351M
Please don't pull out in front of me! The last thing I want to do is play identify the pieces with you or your car.
Robert
1978 F-150 4x4 Stepside 351M
Please don't pull out in front of me! The last thing I want to do is play identify the pieces with you or your car.
More Turbo
Joined: Jun 2001
Posts: 571
Likes: 1
Oil Weight
I use to run 20W-50 in my truck and over the corse of several years it wore out the oil pump. over the course of the years I noticed a small but steady decline in oil pressure, till it finally got so lo that I was weiry to drive it. I replaced the pump and now stick with 10W-30
