If i were to use Royal purple in my Engine can i switch back to say mobil 1 or Amsoil? or am i stuck with RP

 

I switch in and out constantly. I am running RP right now as i found a deal on it, next tme around it will be mobil1 again.

 

oh so its safe.

Nice guess imma just use my last RP and then later swtich to something else. hopefully my gs4 doesnt mind.

 

There is no reason why you cant switch between different synthetics... I wouldnt constantly switch from synthetic back to conventional though. But switching to different synthetics back and forth is safe.

 

Somebody told me the new Mobil One is not as good as the old Mobil One...

Any truth to this?

 

beating a dead horse, the topic has been discussed NUMEROUS times. I have been using Mobil 1 for years and never had any ill effects, my analysis results are always right on the money.

BOT, yes it is more than ok to switch back and forth BETWEEN SYNTHETICS, not so much between dino and synthetic. In switching between synthetics, the only thing is if you switch M1 to RP and then back to M1, you are gonna take a step backwards, but i kinda have to, I dont want to afford $9.00 a quart for oil!

 

One step back in performance
One step forward in the wallet

 

ok so i bought some Royal purple... 75W-140 i think.. I can use 140 for my Diff right?

 

Wow isn't that kinda high? I thought 85w-90 was pretty standard?

 

hah yea 140 is perdy dam high.

it also says it contains Limited Slip additives... is that bad to use for STOCK open diff?

 

yeah, i wouldnt use anything that thick for fear of lockup/gelling issues.

Ill put it this way, in military grade trucks, including 45 ton 8 wheel drive HEMTT wreckers, we use good ol' NAPA 80/85w-90.

 

LS additives won't hurt a thing. The 75/140 stuff is a bit thicker at temp, but it flows like a 75W at colder temps thanks to the viscosity index improver.

I'm running Pennzoil Platinum 5/30 in my 229K LS400, and it allows me to have only 2 oils on hand - the PP also goes into the Sienna and Prius in the family stable, while the beater Quest gets Chevron Delo 15W-40.