Mixing Castrol 10w60 with Shell 10w60

USCTROJANSFIGHTON · 09-07-2015, 12:14 PM

Car is still under warranty
I just had the dealer do an oil change...and they are using the NEW TWIN TURBO SHELL OIL 10w60.

I still have the Castrol TWS 10w60.

Can I can mix the two together? I.e. like topping off? Or would I have to get rid of my 10w60. Still have 4 bottles.

Thanks

gatorfast · 09-07-2015, 01:18 PM

Yes topping off with the castrol 10w60 will be perfectly fine.

USCTROJANSFIGHTON · 09-07-2015, 04:25 PM

Quote:

Originally Posted by gatorfast

Yes topping off with the castrol 10w60 will be perfectly fine.

Awesome!

dparm · 09-07-2015, 05:34 PM

API certified oils must be mixable with other API certified oils -- it's a key requirement to get the certification.

Is it optimal? No. Will it cause problems? Unlikely. The two oils are fairly similar to begin with. It's not like you're mixing a 0w5 race oil with 20w50 diesel oil.

In fact, some blenders encourage you to mix [their own products together] to get the desired weight. Red Line is one company that puts this right on their own website.

redpriest · 09-08-2015, 05:35 PM

In the opposite situation as you - running castrol using the new shell BMW oil to top off as I burn through. No issues so far.

09-07-2015, 12:14 PM	#1
USCTROJANSFIGHTON Second Lieutenant 24 Rep 217 Posts Drives: Car. Vrooom. Join Date: Sep 2012 Location: San Diego,VEGAS,IRVINE,LA,MOON iTrader: (1)	Mixing Castrol 10w60 with Shell 10w60 Car is still under warranty I just had the dealer do an oil change...and they are using the NEW TWIN TURBO SHELL OIL 10w60. I still have the Castrol TWS 10w60. Can I can mix the two together? I.e. like topping off? Or would I have to get rid of my 10w60. Still have 4 bottles. Thanks
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09-07-2015, 01:18 PM	#2
gatorfast Major General 5023 Rep 6,871 Posts Drives: 718 Cayman Join Date: Jan 2008 Location: SoFla iTrader: (4)	Yes topping off with the castrol 10w60 will be perfectly fine.
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09-07-2015, 05:34 PM	#4
dparm Stop the hate, get a V8 3853 Rep 8,625 Posts Drives: C7 Corvette GS, AMG C63 S Join Date: Jun 2013 Location: Frisco, TX iTrader: (1)	API certified oils must be mixable with other API certified oils -- it's a key requirement to get the certification. Is it optimal? No. Will it cause problems? Unlikely. The two oils are fairly similar to begin with. It's not like you're mixing a 0w5 race oil with 20w50 diesel oil. In fact, some blenders encourage you to mix [their own products together] to get the desired weight. Red Line is one company that puts this right on their own website. __________________ Now: 2017 Corvette Grand Sport, 2021 AMG C63 S sedan Past: 2011.5 M3 sedan ZCP
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09-08-2015, 05:35 PM	#5
redpriest Colonel 2147 Rep 2,527 Posts Drives: 2011 M3/Porsche 992 GT3RS Join Date: Apr 2014 Location: Bay Area, CA iTrader: (0) Garage List 2024 Porsche 911 GT3RS [0.00] 2021 Porsche 718 Sp ... [0.00] 2021 Mazda Miata MX-5 [0.00] 2006 BMW M3 [0.00] 2011 BMW M3 [10.00]	In the opposite situation as you - running castrol using the new shell BMW oil to top off as I burn through. No issues so far.
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