Royal purple
Cargo Master
Joined: Jul 2010
Posts: 3,014
Likes: 115
Will cause a poor result in your bank account, haha.
Seriously, though, I never use the Royal Purple engine oil, but I've used Royal Purple in my truck's rear differential and in my car's transaxle. I have no complaints.
Seriously, though, I never use the Royal Purple engine oil, but I've used Royal Purple in my truck's rear differential and in my car's transaxle. I have no complaints.
i ain't rite
Joined: Mar 2005
Posts: 65,483
Likes: 5,542
From: Marlboro Mental Hospital.
i do not use synthetic in anything, in my opinion it is not needed, and unless the engine was designed to use it by the manufacturer, it just leaks out where regular oil will not.
people keep telling me how good it is, but my 88 now has a little over 494,000 miles on it running plain old valvoline 15 40 all fleet oil, so i will stick with that. .
people keep telling me how good it is, but my 88 now has a little over 494,000 miles on it running plain old valvoline 15 40 all fleet oil, so i will stick with that. .
Laughing Gas
Joined: Feb 2014
Posts: 774
Likes: 25
From: Reno, Nevada
It's probably an overall plus because regardless of whether the engine is in better shape due to the oil, the fact that the owner cared enough to run expensive oil probably means he cared about other things on the truck and kept it in good shape.
Senior User
Joined: May 2013
Posts: 208
Likes: 0
I've got Royal Purple in my differential too. Ford specifies a synthetic for the diff, but doesn't require it for the engine. So, I use conventional 15w40 Rotella with good results. I don't think I could stand changing the expensive stuff as often as specified by Ford, so I figure I'm ahead of the game.
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Senior User
Joined: Jul 2015
Posts: 109
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It's my brothers truck. Being he used to be changed at 7500. It's in perfect shape, never pulled anything . no price premium. Just bb value. Would switching to rotella cause any issues?
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Laughing Gas
Joined: Feb 2014
Posts: 774
Likes: 25
From: Reno, Nevada
Rotella T, in either its synthetic or non-synthetic versions has been designed by Shell for Diesel truck engines. No way is it going to cause any issues.
PREMIUM SPONSOR
Joined: Sep 2003
Posts: 2,630
Likes: 217
From: North East Ohio
The only benefit to running synthetic oils like RP is extended oil changes, and most importantly you need to have a bypass filter, and even then it's only to about 7500 mile changes.
And if you run RP in every part of the truck (motor, trans, diffs, t-case) you will see 1 or 2 mpg increase, as I have been told this by many reliable customers.
And if you run RP in every part of the truck (motor, trans, diffs, t-case) you will see 1 or 2 mpg increase, as I have been told this by many reliable customers.
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'96 7.3 F-350 Reg Cab 4x4 - bought new.
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'96 7.3 F-350 Reg Cab 4x4 - bought new.
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'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
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