Can I mix Driven BR30 with BR30 with Driven BR 15w50

[infiniticrypto]

Hi. I have a new engine that's already been broken in on the dyno. I put it in the truck and with the engine oil cooler stuff all being new......the oil level is down about 0.75 quart to 1 quart. The engine has BR30 in it (conventional 5w30)((5-ish quarts)) and I happen to have a full quart of BR 15w50 here from a previous project. I'd rather not have to wait 2 days and pay in shipping what the quart of oil costs if I don't have to. Thanks

 

[SubieRubyRoo]

Sure, why not? Then order what the engine builder recommended for long-term use.