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ALL synthetic oils the same?? S70 1998

Howdy All,

Probably a stupid question, but if I changed my S70 T5 to Mobil 1 fully synthetic (did a full Amsoil engine flush before), it is absolutely essential that I stay with the SAME BRAND, or are some synth. oils "better" than others??

The best price I have seen for Mobil 1 is about $2.98/ quart (in CA) on sale, but this week I see PENZOIL Full Synthetic for only $1.89/ quart on sale, and I was thinking about stocking-up while I can!!

Any opinions?? And, do I have to stay with the same weight oil?

TIA,
HB






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