RP or AMS OIL
#1
#2
Use Ford Semi-Synthetic, change it every 4,000 miles or so. Best $24 you could spend. I am an Amsoil dealer, but always recommend changing the oil more frequent. I have plenty of good stories of guys that religiously change oil every 3k-4k. Matter of fact, Amsoil has a bulletin out recommending that 6.4 owners NOT listen to manufactures spec on oil changes (that's 7,500).
So, my vote is the $24 Walmart Ford Semi Synthetic oil change at like 2/3 the frequency that Ford recommends.
So, my vote is the $24 Walmart Ford Semi Synthetic oil change at like 2/3 the frequency that Ford recommends.
#3
It's not a really scientific opinion, but I am not impressed with Royal Purple versus Mobil 1.
And it has nothing to do with engine oil, but I will explain:
The rear in my '01 had a slight whine on the highway, did it brand-new, under very low load, almost coasting. Did it for years. One day, I decided it was time to paint the diff cover otherwise it was going to rust through.
Removed, painted, reinstalled. Only synthetic 75w140 I could find locally was RP at the time. So, in it went.
The whine was still there, no change.
Cover developed a leak (my own fault) so I had to pull it again. Figured, try Mobil 1 this time.
Whine is GONE, and has been for 5 years.
This shadetree mechanic isn't going near RP ever again.
Either use the Ford stuff, or go with Mobil 1.
And it has nothing to do with engine oil, but I will explain:
The rear in my '01 had a slight whine on the highway, did it brand-new, under very low load, almost coasting. Did it for years. One day, I decided it was time to paint the diff cover otherwise it was going to rust through.
Removed, painted, reinstalled. Only synthetic 75w140 I could find locally was RP at the time. So, in it went.
The whine was still there, no change.
Cover developed a leak (my own fault) so I had to pull it again. Figured, try Mobil 1 this time.
Whine is GONE, and has been for 5 years.
This shadetree mechanic isn't going near RP ever again.
Either use the Ford stuff, or go with Mobil 1.
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Batman7777
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