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Which AMS oil is better than Royal Purple? Signature?
I pay about $45-$50 for a 5 quart bottle of 10w-30 Royal purple. Sometimes my parts store has a deal that for about $55-$60 you can get Royal Purple and a K&N oil filter.
I pay about $45-$50 for a 5 quart bottle of 10w-30 Royal purple. Sometimes my parts store has a deal that for about $55-$60 you can get Royal Purple and a K&N oil filter.
Does AMS have a 5 quart bottle?
they don't have 5 quart bottles no. They sell Gallon bottles which is about 4 quarts and that is available for almost everything besides the OE oil.
Which AMS oil is better than Royal Purple? Signature?
Again, a bit of a loaded question. If you are go by test data, all of our oils test better than Royal Purple. I personally think that the signature series is the best we carry that can be run on the street, but even our cheapest OE synthetic oil scores better than Royal purple on all tests.
Here, AMS's cheapest OE oil vs RP for 10W30...besides out scoring them on 4-ball wear test, see below as I have tried to take the important info to look for out.
AMS
Pour point:-40*F
Viscosity index:145
Royal purple
Pour point: ?
Viscosity index: 141
I don't care much for flash point/fire point numbers, 450-480*F is high enough and both AMS/RP are 1-2* apart.
Pour point is important if you want to use the oil year round. This number tells you at what point your oil will not move if you were to put it on an inclined surface for approximately 5 seconds or so. So basically, past this point, your oil is going to need to warm up before it can efficiently lubricate your parts.
I haven't found a Pour point for RP, they haven't listed it in their specs, in fact many manufacturers don't. I don't really think you have to be overly worried about this number though unless you live in a real cold climate, since you're in Texas, I probably wouldn't worry about that number at all.
Viscosity index measures how thick an oil is vs how much it changes with temperature. The higher the number is, means the less change there is and the essentially the better the protection your motor has, especially at higher rpm.
In case you want to view the info for yourself, here is a link to the 10w30 OE (cheapest synthetic oil) we carry, which still rates better than Royal Purple does.
they don't have 5 quart bottles no. They sell Gallon bottles which is about 4 quarts and that is available for almost everything besides the OE oil.
Again, a bit of a loaded question. If you are go by test data, all of our oils test better than Royal Purple. I personally think that the signature series is the best we carry that can be run on the street, but even our cheapest OE synthetic oil scores better than Royal purple on all tests.
Here, AMS's cheapest OE oil vs RP for 10W30...besides out scoring them on 4-ball wear test, see below as I have tried to take the important info to look for out.
AMS
Pour point:-40*F
Viscosity index:145
Royal purple
Pour point: ?
Viscosity index: 141
I don't care much for flash point/fire point numbers, 450-480*F is high enough and both AMS/RP are 1-2* apart.
Pour point is important if you want to use the oil year round. This number tells you at what point your oil will not move if you were to put it on an inclined surface for approximately 5 seconds or so. So basically, past this point, your oil is going to need to warm up before it can efficiently lubricate your parts.
I haven't found a Pour point for RP, they haven't listed it in their specs, in fact many manufacturers don't. I don't really think you have to be overly worried about this number though unless you live in a real cold climate, since you're in Texas, I probably wouldn't worry about that number at all.
Viscosity index measures how thick an oil is vs how much it changes with temperature. The higher the number is, means the less change there is and the essentially the better the protection your motor has, especially at higher rpm.
In case you want to view the info for yourself, here is a link to the 10w30 OE (cheapest synthetic oil) we carry, which still rates better than Royal Purple does.
Hmm makes sense. How big of a difference is 141- 145 viscosity index?
I don't know how to really explain it in real world differences lol. All I know and can explain is that the higher the number in the index the better, as the lower the number is it means that the oil thickens more when it cools and thins more when it gets hotter... how much of a difference each point makes I can't tell ya.
What I can tell you though is that they group the oils into different categories:
Group IV oils usually have a viscosity index of 150 or higher
While the bottom end Group I and II petroleum based oils (non synthetic) have less than a 140 index.
So basically, AMS OE, and RP are a middle of the pack oil, while AMS does have the edge on RP
The signature series oil that I like and use, has a Viscosity index of 157, which places it in the highest category of Group IV oils
I don't know how to really explain it in real world differences lol. All I know and can explain is that the higher the number in the index the better, as the lower the number is it means that the oil thickens more when it cools and thins more when it gets hotter... how much of a difference each point makes I can't tell ya.
What I can tell you though is that they group the oils into different categories:
Group IV oils usually have a viscosity index of 150 or higher
While the bottom end Group I and II petroleum based oils (non synthetic) have less than a 140 index.
So basically, AMS OE, and RP are a middle of the pack oil, while AMS does have the edge on RP
The signature series oil that I like and use, has a Viscosity index of 157, which places it in the highest category of Group IV oils
Nice. I like that. I am still going to do some research but that is good information, thanks!
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