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Old 3rd September 2001, 20:24   #1
Ashok Arora
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Mobil 1

Is it ok to top up between oil changes with Mobil 1 (especially during the first 3000 miles)? If not, then what would you recommend?
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Old 3rd September 2001, 22:28   #2
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If your Beast is model 2000 and production before 3/00 you have to use the 10W60. In the 2001 model you use 5W30.I don't know if mobil has this type of oil.I know only 15-50 from mobil.I use Castrol RS 10W60.
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Old 4th September 2001, 04:19   #3
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Mobile 1 does make a 5w30 synthetic (label has a green perimeter vs the red of 15w50)
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Old 4th September 2001, 16:47   #4
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No problem, the important is the viscosity, Mobil is a very high quality, i think is better than Castrol.
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Old 4th September 2001, 18:23   #5
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... so how about using Mobil 1 all the time instead of Castrol?
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Old 4th September 2001, 18:35   #6
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I do.
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Old 4th September 2001, 19:15   #7
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Tom, you didn't say whether your car calls for 10w60 or 5w30, but if you're using all Mobil 1 I'm assuming it's the latter.

As to the original question - the owner's manual states that if the recommended oil is not available you can use small amounts of other synthetic oils to top off between oil changes. I had to do that recently. My car calls for 10w60. I was down half a quart on a Saturday afternoon and I found myself at AutoZone having to choose between Castrol 5w50 and Mobil 1 15w50. I picked the Castrol, on the theory that since half a quart out of six wouldn't make much difference in viscosity (I worked it out later to 9.58w59.17 for the Castrol vs. 10.42w59.17 for the Mobil 1), it would be better to stick with the same brand so that the additive packages would not differ.
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Old 4th September 2001, 19:19   #8
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dwasifar,

You're right. Mine is June '00 build that calls for 5w30.
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Old 4th September 2001, 19:20   #9
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I don't know, i need to use in my car the 10W60 and only castrol has this type.If will have the mobil i prefer but i think it's more like some of us prefer our taste.Both are high quality..The best is the
cheapest
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Old 4th September 2001, 19:26   #10
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Fernando,

Here in the US, the only synthetic 10w60 available is the Castrol RS, and the only place I've found to get it is at a BMW dealer. Castrol tells me there are no other retail sources for it - apparently they import it specifically for BMW. I would have no problem using Mobil 1 if it were available in 10w60 - but as far as I know it isn't, and won't be any time soon.

Given the choice between topping up with Mobil 1 and Castrol, I'd pick the Castrol because it's a closer match to what's already in the engine, but if that weren't available I'd use the Mobil 1 15w50 and I'm sure it would be just fine too.
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