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any "SN Plus" AND A3/B3 (or A3/B4) oils?

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any "SN Plus" AND A3/B3 (or A3/B4) oils?

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Old 02-13-2019, 11:35 AM
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any "SN Plus" AND A3/B3 (or A3/B4) oils?

I noticed there is a new oil spec, SN Plus, which is supposed to be certified for knock prevention on DI engines like ours,
and my 2009 Clubman JCW throws a silent code (no CEL) for superknocking on one cylinder or another about once a month.
I have less than 35K on the engine so I haven't done a walnut blast yet, and it's running great otherwise.
It might be nice to use a good SN+ A3/B4 oil for my MINI, but . . .
Problem is, none of the SN Plus rated oils I've come across have ACEA A3/B3 or A3/B4 specs, and I fear the A5/B5 oils may
be thin and wimpy to provide adequate protection in an S or JCW N14 engine.
Mobil 1 Advanced Fully Synthetic 5W30 has the highest 100C viscosity of SN+ oils I could find, but it's A5/B5 and no LL-01
(LL-01 less important since I'm changing oil every 5K).

Since the SN Plus spec is relatively new, is it just a matter of time before a 5W30 A3/B4 or 0W40 A3/B4 oil comes out, or
are the two specs somewhat mutually exclusive.
 

Last edited by cristo; 02-13-2019 at 06:20 PM.
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Old 02-13-2019, 06:18 PM
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Apparently, Mobil 1 High Mileage 10W30 is A3/B3 and SN Plus
and pretty close to a good viscosity for a MINI.
I think that’s the only one.
 
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Old 02-17-2019, 06:53 AM
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Originally Posted by cristo View Post
Apparently, Mobil 1 High Mileage 10W30 is A3/B3 and SN Plus
and pretty close to a good viscosity for a MINI.
I think that’s the only one.
If your concern is knocking, wouldn't the easiest way to prevent that be with the fuel/additive you use?
 
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Old 02-17-2019, 07:40 AM
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Recommended oils have been a problem for mini engines for a long time. I use a high zinc oil in all my cars. None of it manufacturer recommended. They recommend oil based on big payouts from oil companies and to achieve good mileage. They also dont want to hurt emissions equipment since they are required by law to warranty those parts for almost ever. Do an oil change every 3000 miles with a high zinc oil and your engine will last.
 
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Old 02-17-2019, 08:11 AM
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The low rpm preignition that sn plus oils
address is from oil droplets in the
combustion chamber.
Among other things, they reduce calcium
and increase magnesium in the additive
package to accomplish this.

I already use a good brand of 93 octane fuel,
and run Seafoam through the vacuum line
and BG-44K in the tank every 5K.
 

Last edited by cristo; 02-17-2019 at 08:22 AM.
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Old 07-10-2019, 04:37 AM
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After having DTCs (but no CELs) for superknock about once every 2-4 weeks for most of a year,
I have had not had any in the last 3 months shortly after changing to SN+ rated oil this spring.

(of course now that I've said that ...)
 
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