Engine oil.....regular, synthetic or blend?

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chin_k
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Re: Engine oil.....regular, synthetic or blend?

Post by chin_k »

The case I brought from Costco does not say "High Performance" on it. Can I mix it with the HP or High Mileage oil with the same grade and brand? Or the difference of the additives in the blend will not be good for mixing it 1:5? I have seem DIYer who mix 5W-20 with 5W-30 when they don't have enough oil on hand, but I am not going to to that.
2000 Concourse dinette, on 1999 6.8L Ford E350 Triton V-10 Chassis
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