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Need advice on deciding which motor oil to use. My choices are Quaker State Ultimate Durability Full Synthetic, Quaker State (green bottle) conventional, Peak conventional, or Warren Unilube conventional. Requirements are 5W-30 or 10W-30 with OCI's of 5k-7k & vehicles that are going to use them...

Well, down here in Texas that is cheap. I have never saw motor oil down here for under a dollar a quart, not even clearance stuff.

Found some Warren-Unilube 10W-30 motor oil in an old mom & pop grocery store for $2.50 a quart. Its API approved and ILSAC GF-5 approved. I contacted Warren Unilube headquartered out of West Memphis, Arkansas and talked to the vice president of the company and he says it's as good as any top...

I was thinking about going with either Quaker State Ultimate Durability Full Synthetic 5W-30 because Wally World has the 5 quart jugs for $20 & some change or some Peak 5W-30 conventional for $3 a quart at Big Lots. I've heard good reviews about both of these oils.

Found the Rotella 5W-40 full synthetic at Wal-Mart for $21 and some change for a gallon. So you guys don't think 5W-40 is too heavy for this car? I thought the owners manual may have meant the 5W-40 was for the turbo model.

Purchased a 1998 Volvo S-70 car with the 5 cylinder 2.4 liter NON-Turbo engine from an older couple about 4 months ago. Car is in immaculate condition with darn near every service receipt. Car was always serviced at the Volvo dealer except I can't figure out what kind of motor oil was used in...