Mix Oil Brands?
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Mountain Pass
Joined: Dec 2006
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From: Nor Cal
Mix Oil Brands?
Walmart never has enough Rotella Full Syn so I decide to buy the last three gallons on shelf plus Mobil 1 Full Syn for diesels. I feel like I should know this but I suppose it doesn't make a real signficant difference if I combine the different brands. Right?
Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
I doubt it makes any difference what-so-ever. I bet Shell or Mobil will tell you differently though. 
On my last change, I switched to Motorcraft oil after running Rotella T for ages. There was as about 2 1/2-3 qts of Rotella still in my engine (heads/hpop etc) when I poured in the Motorcraft...so by default I've mixed brands of oil anyway.
On my last change, I switched to Motorcraft oil after running Rotella T for ages. There was as about 2 1/2-3 qts of Rotella still in my engine (heads/hpop etc) when I poured in the Motorcraft...so by default I've mixed brands of oil anyway.
Lead Driver
Joined: Sep 2005
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From: Norco,CA
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Mountain Pass
Joined: Dec 2006
Posts: 179
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From: Nor Cal
Both you guys make sense. I just can't imagine two high quality oils of the same genre having any real chemical reactions causing a loss in effeciency especially in a gross broad engine function. But I bet someone knows the empirical data on such....ahh...doubt it. Though...yes...I would always think it best to use one brand.
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