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Old 07-30-2009, 12:56 PM   #1
PSUbaru_guy
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Default Using API SL oil when manual calls for API SM

Hey guys,

So I just changed my oil yesterday and I wasn't paying close attention when I bought the oil. I picked up 5 qts of Royal Purple 5W-30, it's tested to API SL standards. When I was changing the oil, I checked the manual and it said to use API SM oil although SL is ok if you live in/near the desert and experience high temperatures. I live in the desert in WA and it's going to be really hot here for the next 2 months or so. Does anyone think that I will have problems with the SL oil I used? I don't know anything about the differences between the standards testing but the viscosity/weight are the same. Any help is greatly appreciated.

Oh, I spoke with the parts dept at my local dealership and they said that I shouldn't have any problems but I just wanted to ask the NASIOC experts and get your opinions.

Thanks!
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Old 07-31-2009, 08:43 AM   #2
AndyH
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Shouldn't be a problem at all, although I'd recommend keeping a close eye on the oil level as RP 5W-30 is a pretty 'thin' 30-weight oil which has been known to shear down to a 20-grade oil over a fairly short period of time. Best to watch the oil level to make sure your engine isn't consuming the oil.
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Old 07-31-2009, 09:39 AM   #3
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ok thanks Andy! I'll keep an eye on the level.
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Old 07-31-2009, 12:02 PM   #4
Uncle Scotty
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you couldnt PAY ME to put that RP garbage in my engine

no ****ing way

bad idea....great way to a spun bearing
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Old 07-31-2009, 12:50 PM   #5
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I was running RP 5w30 for the 3 oil changes and I now have a spun rod bearing going to be researching oils to see what is the best. I know motul is good but very expensive.

The bearings are so small on the boxer and I won't be using RP ever again!
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Old 07-31-2009, 06:12 PM   #6
PSUbaru_guy
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Oh really? damn, now I want to change the oil...
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Old 07-31-2009, 09:36 PM   #7
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Quote:
Originally Posted by PSUbaru_guy View Post
I don't know anything about the differences between the standards testing
It's in appendix G of this document:
http://new.api.org/certifications/en...forprint-2.pdf

keep in mind that they are just a sequence of tests - in other words, just because an oil is listed as SL doesn't mean it wouldn't meet the requirements for SM. That being said, RP does shear down pretty quickly.
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Old 08-02-2009, 11:34 AM   #8
bluesubie
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When you're down 1-2 quarts in 1,000 miles, just throw in some RP 20W50. You should have a decent 40 grade then.

-Dennis
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Old 08-06-2009, 09:41 AM   #9
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Quote:
Originally Posted by bluesubie View Post
When you're down 1-2 quarts in 1,000 miles, just throw in some RP 20W50. You should have a decent 40 grade then.

-Dennis
Mixing 5W-30 with 20W-50 does not give you 40-grade oil. All is does is give you a mixture of of the two different weight oils.
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Old 08-07-2009, 06:38 AM   #10
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Quote:
Originally Posted by djosbun View Post
Mixing 5W-30 with 20W-50 does not give you 40-grade oil. All is does is give you a mixture of of the two different weight oils.
you need to stop posting as the above shows you need to listen more than post

and you are wrong
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Old 08-07-2009, 10:31 AM   #11
bulwnkl
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Right or wrong, major oil companies will tell you the same thing. So, it's not unlikely that the person was listening to someone from a company that actually manufactures motor oil.

Aside from that, neither of you are necessarily wrong, nor are either of you necessarily right. All multi-grade motor oils are made from multiple base oil grades blended together. And, any two examples of a given grade are not necessarily made with the same base stock blend. So when you combine 2 very different grades together, you don't know for sure what the result will be, exactly. Combine that with the fact that it is far more common than not that a 5W30 and a 20W50 (even from the same company) will have extremely different additive systems, and it's really a crap shoot. Shouldn't normally cause harm, but it's much more complex and frankly different than simply averaging the numbers, even if you use a blending calculator. The 100C viscosity is reasonably likely to come out as a 40-grade somewhere, but the rest you're guessing at. Even the 40-grade part could be a decent one or a poor one depending upon the components of the 2 you mixed.
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