oil change question
Drifting
Joined: Jun 2010
Posts: 1,434
Likes: 2
From: Harrisburg Pa.
Burning Brakes
Joined: May 2005
Posts: 956
Likes: 0
From: Philadelphia pa
Dumb question .... I have a 5qts of Mobile 1 and 2 Qts of Royal Purple.... I assume there no harm in mixing them then I change my oil this weekend. was only going to use 1.5 of the royal purple.
Race Director
Joined: Aug 2003
Posts: 13,421
Likes: 8
From: Lake Mary Florida
I would not mix.
Some engine manufacturers warn against mixing brands of oil. Some times they are not compatible and will damage seals. Why risk it for a $6./quart of oil. Just pick up two more quarts of M1 at Wally World.
Some engine manufacturers warn against mixing brands of oil. Some times they are not compatible and will damage seals. Why risk it for a $6./quart of oil. Just pick up two more quarts of M1 at Wally World.
Last edited by Jet-Jock; Oct 13, 2010 at 06:48 PM.
Burning Brakes
Joined: Mar 2010
Posts: 1,189
Likes: 4
From: Freeport, FL
Not a dumb question, but you do need to state the weights of the oil. I assume the same weight???
I think all you're gonna get is a lot of do's and don't do's...
I can only offer my opinion as I dont have references to list, but as long as the viscosity is the same you can mix oils, and you can also mix synthetic and conventional oils of similar weights as well.
With that said, I personally would feel more fuzzy inside just buying the extra quarts needed so that its all the same and maybe use the Royal Purple as "top off" oil or whatever.
Anyways, guys, please don't quote me as I clearly stated that this was my opinion.
Drifting
Joined: Feb 2005
Posts: 1,643
Likes: 167
Not a dumb question, but you do need to state the weights of the oil. I assume the same weight???
I think all you're gonna get is a lot of do's and don't do's...
I can only offer my opinion as I dont have references to list, but as long as the viscosity is the same you can mix oils, and you can also mix synthetic and conventional oils of similar weights as well.
With that said, I personally would feel more fuzzy inside just buying the extra quarts needed so that its all the same and maybe use the Royal Purple as "top off" oil or whatever.
Anyways, guys, please don't quote me as I clearly stated that this was my opinion.
I think all you're gonna get is a lot of do's and don't do's...
I can only offer my opinion as I dont have references to list, but as long as the viscosity is the same you can mix oils, and you can also mix synthetic and conventional oils of similar weights as well.
With that said, I personally would feel more fuzzy inside just buying the extra quarts needed so that its all the same and maybe use the Royal Purple as "top off" oil or whatever.
Anyways, guys, please don't quote me as I clearly stated that this was my opinion.
as long as the different oils used are the same viscosity. And I will add one more caveat: as long as the oils used all meet GM spec.
Race Director
Joined: Aug 2003
Posts: 13,421
Likes: 8
From: Lake Mary Florida
Glad to hear things are good again.
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